Like it's been said above, the first level of Bad Company 2 had me wanting a WWII game again, but Battlefield 1943 convinced me even more of that. Imagine a full game with maps from all fronts of the war, a single player campaign that can take you across all sorts of battles including infantry, tanks, aircraft, recon, etc. that gives you a great variety, and of course, the destruction from FB2 that could obliterate the jungle, bunkers, cities, airfields, etc.
I just want to see the return of ship battles in the BF series. It's been the thing I miss most from BF1942 and could you even imagine the awesomeness of naval battles on FB2 and even the destruction you could cause from shelling the beach in your destroyer? I CAN DREAM...
They have the technology now to make a true sequel to BF1942 that could blow people away and show us that WWII doesn't have to be stale still if there's enough innovation and awesomeness going on.