Oh yea, its great that Activision are spending a crap ton on this game, so I imagine they obviously understand the importance of making a new game which will interest consumers.
As for the destructible environments and large maps, a little of those would be good but I hope they don't go overboard with those. I don't want this to become Battlefield, I play COD because its COD and for its tight gameplay. If I wanted to play in MASSIVE maps I would just get BF, but I won't be getting BF because I don't like that kind of gameplay, takes waaay too long to get into a confrontation.
So yea, make COD as we know it, and make small innovations which improve gameplay. But most of all, FIX all the damn problems that plaque the previous title, that would be the best addition for me.