Here are my questions/concerns:
1. How much of a gimmick is SMART, and how much is it useful? I could see it radically impacting the game in a positive manner, with people coming in from previously inaccessible angles, or just being "oh you press a button instead of using a crate to jump up there". Sliding looks neat, though.
2. Unlocks. How much stuff will people have when they start? How quickly will things unlock? WIll weapons unlock for all classes simultaneously? Will all classes get to use all weapons?
3. I'm interested in what the "challenges" are. Timed single-player tutorials or what?
4. Map size. I suspect it's going to be a linear progression like the ETQW maps were (one objective after another).
5. Integrating single and multiplayer seems cool: pulling down people to replace bots in your game if desired (Shogun 2 did this, kinda).
6. The effect of body types. Just speed/climbing ability/damage?
7. The dynamic objective wheel might be cool.
8. PC controls. Specifically, how the objective wheel is going to work on a keyboard.
9. I think letting people use revive syringes whenever instead of paddling someone and having them become immediately shot (ahem, Battlefield) is neat.
10. Bots