The Xbox Live service was experiencing a lot of troubles over the Christmas period with many people complaining about account creation problems and poor connections whilst playing online in certain games.
In an attempt to apologies for the troubles, Microsoft announced that they would be releasing a free Xbox Live Arcade game. This title will be Undertow, featuring two multiplayer modes for up to 16 players, and a robust 15-level single player and co-op campaign. Players navigate the stormy seas as one of four unique, upgradeable unit types ranging in ability from the fast and agile to the large and powerful. Players then earn points for adding upgrades by killing enemies, completing objectives, and taking checkpoints.
It'll be available for download for a short period of time. Wednesday 23rd January is the first day of release and then you've got until Sunday 27th Jan to download it.
If you've already purchased Undertow then you may be about of luck, we haven't heard anything about them offering another free game for those people that do have Undertow. Hopefully we'll know more about that soon.