Sense Xbox LIVE has been having a few problems over the holiday, Microsoft thought it would be nice to give us Undertow as a apology free of charge, it will be avalable this Wednesday, (JAN 23) 2:00 A.M. PST, through Sunday, (JAN 27) 11:59 P.M. PST, and it will be free to all Gold and Silver members!
If Xbox LIVE members have already purchased the game, they should contact their local support (1-800-4-MYXBOX in North America).
[via Kotaku]