If you’re in the World of Tanks beta on the Xbox 360, enjoy your time this week. Servers will go offline Wednesday, January 29th in preparation for the "final release", presumably signifying a launch sometime soon. Servers are expected to be offline for at least a few days while the update is finalized. When the servers come back up they’ll be open to beta participants only, in-game progress will be reset, game avatars and achievements will be available, and in-game purchases will be implemented and retained along with beta rewards added to the garage.

Wargaming has yet to set an official launch date for the 360 version but will be updating players with early access details in the future.

Source: World of Tanks Xbox 360 Update