I can't really say much ATM will have to wait till game release, Because I thought MW3 would be good after E3, GamesCom and CoD XP last year, even my mate who went to GAMEfest or what ever it was in Birmingham UK run by GAME UK he said it was a good game, then at release said it was shit
So I have hopes over Zombies but Multiplayer I don't want to expect something good when it could be shit same as MW3, Campaign I am expecting differences as they are doing the sort of Over Head gameplay or what ever its called, Strike Force or what ever :p
Hopefully Multiplayer will be good and will keep me entertained longer than MW3 has, Recently I have just got bored of MW3, Black Ops I loved till MW3 was released and TBH still love it, Play Multiplayer every now and then, Zombies most of the time

I suppose Zombies is better than Spec ops but Chaos Mode was also a good gameplay to do