Oh my. Just the other night, while playing Civ IV, was thinking "Man, it'd be great if they'd come out with a new one...." Had no idea one was in the works.
I want more science stuff to discover, because gameplay kinda sucks when reaching the future sciences. I'd like to have way more buildings and maybe a few more weapontypes.
Plus they should really fix some of the diplomacy stuff / bugs. (for example: getting minus points because of closed borders, even if you have them open since you met the other civ.)