they have said they will include paid features that are optional but not have said what they'll be.
Also, returning to gun on gun focused multiplayer is a big thing for me.
From a multiplayer stand point its all about polish and balance. Taking all the feedback from Modern Warfare 2, building up from the core design philosophy of Call of Duty 4 (the simplistic beauty of fast paced gun on gun focused gameplay), keeping what we loved, losing stuff we (including you) didn't, and adding in stuff that will change up the way we play.
Furthermore, we have focused a lot of the new equipment additions in multiplayer to make sure were giving the objective player just as many tools to be better at playing the objective focused gametypes as we do a TDM player.
Its not all about kills, we have to reward the defender of a bomb site, the flag runner, and the guy covering the flag runner, more so than the guy just getting kills and never going near the objective points.