i would want better use of unreal 3 physics engine. where we could shoot support out. it all looked so good in the tech demo a while back.

a bit more non linear.

4 player co op

new weapons

destructable walls. i want a game where you blow your own paths through a building, like the berserkers who smash through doors and walls, i want to grenade or rocket or set a charge on a wall and then blast into the next room, shoot the doors down, or crumble existing doorways so the enemy has to find another way in, locusts could send a berserker through the wall first, and while your buddy hammer of dawns it you have to take out the locusts coming through the hole they just made in the wall. or you could just keep running.

maybe some sort of boobytrap like in far cry. trip mines would be cool.