Planetside-like MMO, except world war 2.
That might be interesting

Could rotate through roles to keep things fresh - U-boat hunting, avoiding Tigers through the Bocage, Chindits deep in the jungle....
Anyway, for me - I like war shooters, so:
- like ArmA / OpFlash, just less clunky;
- BF3, but more like ArmA;
- open environments, longer objectives, scarce resources (bullets), but maybe more in the way of support - airstrikes etc;
- TENSION.
There's no real fear of anything in BF3 - run, spray, kill, die, repeat.
I want to have to THINK about how I'm going to win, or keep my squad alive.
I loved the fact that I could play missions in OpFlash, and would try to get the perfect squad setup to achieve an ambush to take out all the enemy without losing the upper hand.