Far Thee Well Bungie

[Fez]

Bungie has become independent, it splitted from Microsoft just after Halo 3's release

http://uk.xbox360.ign.com/articles/825/825215p1.html

Though you can still count on the chief to return.

[Agent 47]

They still have a long-term deal with Microsoft to provide content and games. All this means is that they have become Bungie Studios LLC and can now produce games for other platforms and employ more staff.