Well, most of what these people have told you--the Season Pass has ended, but one more map pack has been released--The Championship Bundle. With very confusing separate purchases and perks. Still nice to have, though--weapons have a much sexier look, you can make virtually all of them The Golden Gun, new emblems, armor and stances have been released. My favorite one is Menace, because, well...

BAM.

343i held a Halo 4 multiplayer contest. In a shocking turn of events, the winner of the Halo 4 multiplayer contest was the number one professional multiplayer Halo player in the country.

A new gametype has been created while some others have retired.
Rumor has it that another new gametype is in the works.

They took away my beautiful Multi-Team. We both missed the best playlists ever: Rumble SWAT and a sweet-ass gametype where only Snapshots(no-scoping) count.

And as far as I know, not much else.