The physics. Particularly curious to see how driving handles, but I can't wait to see how euphoria works in gta 5 compared to max payne 3(if it's at least the same as max payne 3 i'll be happy) for shooting people. it actually adds replay value because nothing ever happens the same way
other than that I'm looking forward to wilderness and exploring like others have mentioned
Definitely exploration. I also want to see the character switching mechanic and, of course, experience a new Rockstar story. They haven't come out with a true sandbox experience since Red Dead, it's time for a new game.
http://www.youtube.com/watch?v=7FyJoGXR__8 - New gaming series My podcast: hulkshare.com/inferiorminds