One of the new reveals at Call of Duty: XP is the new "Kill Confirmed" mode. This game type plays out like a regular team deathmatch except now when a player is killed, they drop dog tags. Players then need to collect the dog tag over a player's corpse in order to score a point. If a teammate is downed, the ally team member can collect the dog tag from their teammate and deny the enemy team the score.
Additionally, players can now create user-generated game modes. I didn't get a chance to mess with this just yet, but it sounds like you can do whatever the hell you want as far as the game modes goes. You can also sync your custom game type to Call of Duty Elite, where friends can rate and download your creations to try out themselves.
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This 2015 D.I.C.E. Summit talk explains the entire history of Call of Duty's zombie mode
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