Hello people of gta6, this is something I've been working on for a while now, it's my ideal concept for Rockstar Games' future title, Grand Theft Auto VI.
This is a long post however, you have been forewarned.
So, with all that being said, hope you guys enjoy it!
Let's begin with an overview:
Grand Theft Auto VI is the biggest Rockstar title yet, approached with the most advanced systems ever. GTA VI will be released on Xbox Series X, PS5, and PC only, with the online mode (more on that in the next part) releasing a month after release. The game itself takes place in 3 key locations (technically 4):

1. Vice City (Expanded and Enhanced), in the fictional state of Flores (based off Florida)
2. Carcer City, in the fictional state of Garrison (based off Detroit, Philadelphia, and Chicago)
3. The People's Republic of Del Castillo (Based off of Cuba and Brazil, respectively)
4. Liberty City (VERY linear, certain portions of story playable)

Vice City:

Vice City has been greatly expanded, and now includes 2 other key locations based off of Orlando and Tampa: Mamba and Paxville. Paxville is based off of Orlando, and includes 2 different theme parks: Fun-World & AnimalDome (both based off Disney World/Universal Studios and SeaWorld).
Fun-World is a one-stop shop for having the most fun you can have. From fun-rides to the weird candy the man near the entrance sells, players can ride rollercoasters, take pictures with mascots, and do side-missions from the management and employees of Fun-World.
AnimalDome is a bit more based on SeaWorld and appeals to players that want animals in the game, whether in hunting, fishing, or even exploring. A new side-activity you can do is hunt for legendary animals (all across the map) and donate them to AnimalDome for rewards. It ranges from lost fish in lakes and oceans near untouched waterfalls, all the way to rare birds in forests alike.
The landscapes such as the marshlands are similar to Bayou N.W.A from RDR2, with alligators and crocodiles alike in wetlands, with many other secrets to uncover.
One key icon is the Gator Chain, which is based off the real life Florida Keys, 8 islands pulled together by a single highway.
Another key icon is the Green Pastures, which is based off of the real life Everglades, a subtropical wetland in the heart of south Florida, filled with all kinds of natural society.
A new air force base, Fort Kayak, is also included within the state as well.

Carcer City:

The newest addition to the series, Carcer City is supposed to be gloomy and dark, that of rivaling Vice City's vibrant feeling with the lights shining at night. The roads are narrow and sleek, and are very easy to get lost in because of the grid zig-zag layout. At day, you find old factories blowing out dark smoke, with lower class people getting ready to go work in their old crusty cars. The feeling heavily changes at night when you find the darker parts of the city emerged. Get yourself downtown and on rooftops of buildings, you'll find yourself feeling like Batman looking down at all of Gotham City.

The People's Republic of Del Castillo:

This is solely an island based on the likes of Guarma. On one side, you have favelas in a small, compact, linear city with a mini-airstrip for an airport, while it slowly moves onto tropical forests on the other side of the island. Free roaming is fine, but be careful as there are others who are watching you. Be aware at all times no matter what.
As for Liberty City, a small portion is only playable for certain missions only, incredibly linear.

Gameplay:

The gameplay is similar to that of a mix between IV/V (realism and arcadey-ness). The car feeling is similar to IV when crashing and whatnot, but also contains elements of V's driving. Interaction with NPCs is more realistic and grounded. Walk around in a suit and people ask if you have somewhere important to be, walk around in punk clothing and get trash thrown at you. Red Dead Redemption 2's interaction system with NPCs returns with a new change: multiple dialogue options. Say you choose to greet an NPC and ask if they need help with anything. They might say yes and you could be given with two choices: a) "Sure, I'll help out!" or b) "Alright, well, hope it gets done then!".
You can choose the way the characters are. Aside from antagonizing NPCs, you can pave a path for these characters depending on the way you want.
Wanted levels return, as well as the 6th star. Here is the new way the wanted system would react when given stars:

• 1 Star: Cops Chase You, Ram into Vehicle if needed. Given a ticket ($25, $50, $75, $100, or $125) depending on what the charges were, and the star is dropped.
• 2 Star: Cops use tasers, use batons and whatnot to attack. You can get "Busted" if they catch you.
• 3 Star: Angry Cops chase you and try to take you down, no exceptions.
• 4 Star: Same as 3 stars except more cops are deployed and more aggression is applied.
• 5 Star: NOOSE deployed.
• 6 Star: Military and State-Guard deployed, locking off all airports (unless broken into or in the air already). Very hard to survive.

A new gameplay experience that is added is backpacks or duffel bags. This will not be realistic in the sense where it will weigh down your character and slow them down. You can store different things in either one now, whether it be snacks for refilling health, armor, or other materials you can find. You can find collectibles across the map and store them in there.
Another returning feature is the stats: energy, driving, and flying. Energy encompasses the other stats such as stamina, strength, etc. The more energy you can max out, the more stamina and more health you have. Driving and flying are the same as before.

Story:

In terms of story, I think Project Americas' narrative based off of the leaks seem very interesting, and also makes for interesting scenarios gameplay-wise during the smuggling missions. Another feature I 100% want back is heists. They were done amazingly in V with their setups and then finales where you had somewhat of a variety was fun for the replay ability. The same can also be said for the Diamond Casino And Resort Heist and its diverse offerings.
For characters, in terms of playable ones, I would enjoy seeing 2 protagonists this time around, maybe a male and female if possible.
The game could end with 3 endings, one where our characters become enemies, one where they remain neutral (friends), and one where they begin a relationship or something like that.
Other characters could be possibly a funny crooked lawyer (think Saul Goodman), maybe another Phil Cassidy-esque character as well if we're heading back to Vice (IF that is).
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Last Topic, Time Period (?):

So, this is the big one. I'm having some trouble picking what time period might fit well for my ideal game.
Normally, I would say the 1980s, but even then some people wouldn't really enjoy it, so I decided to take a look at past games and see where this game might fit well in terms of time period:

1. GTA lll (2001): 2000s (2001 specifically)
2. Vice City (2002): 1980s (1986 specifically)
3. San Andreas (2004): 1990s (1992 specifically)
4. IV (2008): 2000s (2008 specifically)
5. V (2013): 2010s (2013 specifically)
6. Online (2013-2020): 2010s - 2020s (Specifically unknown, speculated 2020)

With this being said, I think one time period that could totally work is the 2000s, but instead of 2008 like IV or 2001, I say mid 2000s: somewhere around 2004 - 2006, with some flashback missions dating back to the 1980s (1984, 1987, or 1989).
Now, the internet as we know it wasn't fully developed like how it is today, but it was still actively rising. Funny internet videos and downloading was the norm during that time. Rockstar, with its satire can actively parody the internet as it did with IV and V.
Instead of using the internet to buy cars, players now actively have to go to dealerships, each with their own specific kind of cars (legendary motorsport with their fancy cars, warstock with heavy vehicles, etc).
Now, for the flashback missions. Thinking realistically, it's almost impossible for Rockstar to create different models and whatnot for two different eras.
Now, what I PERSONALLY can see Rockstar doing, if they do decide to go down the flashback route, I can definitely see them create a VERY linear mission-design for a small portion of the map where a mission takes place, and changing some of the buildings and billboards to fit the era (in this case, the 1980s).
For example, take Vice City for example. There could be a portion of the city where the buildings are abandoned, roads are cracked up, etc. There could be a story mission where it takes place in 1984, in that exact portion of the city, where the roads are freshly paved, and the buildings are lively and booming.
RDR2's jump from 1899 to 1907 is justified, in the sense that most of the map is just environments without as many buildings as GTA.
So yeah, that's about it. Hopefully you guys enjoyed it, I have some more stuff on the way!
If you like to add some new ideas to the existing ones or add on ideas in general, please do so.