Mario and Sonic at the Olympic Winter Games (or M&SatOWG I guess) has has a US and UK release date announced of October 13 and 16 respectively. Coming to Wii and DS, the release will precede the 21st Winter Games to be held in Vancouver in February 2010. No New Zealand release date announced yet, but this should merely be a formality given that the original Beijing Games title released in a narrow window worldwide.
Supporting the Wii Balance Board, the game includes events such as snowboard cross, alpine skiing, figure skating, bobsleigh and ice hockey. Multiplayer is a given, but no word on any Wi-Fi support, and also sadly no mention of MotionPlus support. Mario and Sonic at the Olympic Games sold over 10 million combined Wii and DS units, so Sega and Nintendo will be banking on this ringing the tills this Christmas (only 164 sleeps left!).
Update: New Zealand release has been set for the 15th of October.