I'm pretty sure we've all heard enough hype about this from the scores of pre-pubescent kids who plan on buying it (fyi, the "m" means "moms approve!!11!), but I'd like to see what the anticipation is around here.
I'm not sure about the multiplayer; hopefully Treyarch can fix all the features IW screwed up in MW2. The customization looks pretty promising I guess, especially the emblem editor. Treyarch's goal of discouraging camping is pretty admirable to me, and the fact that they removed stopping power from the perks list is gonna force some people to actually make some creative setups.
Zombies are set to return, and I'm definitely excited here. My prediction is that zombies is gonna be more objective based rather than pure survival (though i believe there could be a separate mode for this), something like L4D's point A to point B missions. If you've seen some of the promo stuff, the zombie outbreak takes place on an island, inside a large facility.
Single player looks just as exciting as all the previous CoD games, and I'm pretty anxious to play it. I'm pretty sure I'm one of the few people who actually care about this but w/e.