Aliens Colonial Marines DLCs annouced
While the game is still not released (scheduled for 12th of february 2013), Sega announced that it will receive 4 expansion pack, the first one, Bug Hunt being released in March for 15$.
As it seems to be the way to go these days, a “Season Pass” that will give you access for the 4 DLCs is going to be released for 2400 Microsoft points (around 30$).
My advice: Wait a bit before purchasing getting the season pass for Aliens: Colonial Marines. The game doesn’t seem that awesome from what they have shown, and you would most likely find it for pretty cheap 2 months after the release.
You should head to Joystiq website if you want to get an overview of the game.