Multiplayer where you can view all your stats like on bungie.net from your console (like in cod), campaign with good enemies (now that there are no grunts etc.) and similar multiplayer to CEA, but with new guns
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right