First of all, Sheep, Rise Against FTW. Anyways, My biggest thing in GTA 5 is improving the driving physics. I found that it was somewhat difficult and it just wasn't fun compared to the trilogy's driving. The rest of what I want is just what everyone else wants: more things to do, more side missions, variety of environments, etc. Also I hope they improve the color palette to more vivid colors like SA and VC instead of gray, light gray, and dark gray in GTA4