- Make the money in the game count more (So you can do more things with your money besides buying guns like in the previous series).
- Keep making the phisics in the game better and animations, also a more realistic fighting (hand to hand combat)
- Parashuits
- Access to gym like in San Andreas to change your appearence and so you can choose if you want to be big, skinny or fat.
- More clothes and just more character customization overall.
- More realistic NPCs behavior
- More realistic Police and chase (wanted) system to the game
- A good long storyline
Can't think of much more atm, just hope they have upgraded the realism alot since 2008 and i hope for a huge map with alot of things to do.