This looks like a helluva lot of fun, and I can't wait to play it.
However, and I know this is first reveal; which is why on balance I'm excited, I want the full game to have the following:
-Local MP, preferably 4 player co-op against another online team
-Story mode
-More maps/game modes
More maps and game modes is a 100% given, they've essentially shown us team DM, but no doubt there'll be a standard DM, a capture the flag and defend your base modes as well. We also saw at least 1 extra map in the trailer.
SP campaign I don't know how they could work it, but I hope they figure it out. Even a bot campaign would do the job.
Local MP could be difficult due to how this game uses the gamepad, but then, I guess it could be done using it as a shared map on a coffee table or something.
All that said though; this game looks like it's going to be awesome, and I can't wait to see more of it!