Improvements to the Xbox Live Network.

Background Music coming this summer.

Cortana

Language Region Independence


Meanwhile, coming this fall for every game/gamer:

Clubs on Xbox Live (similar to the PS4 communities)

Looking For Group - Like a wanted ad for multiplayer, allowing you to search for players sharing the same style that you want to play.

Arena on Xbox Live - A tournament platform for various games, including FIFA, World of Tanks and others.