Yep, new rumours today have stated that a Mario & Sonic Olympics sequel AKA Mario & Sonic at the winter olympics based on the 2010 winter olympics in Vancouver has now started game development. More about this news can be found here, and is also rumoured more information will be confirmed in the next month of Nintendo Magazine. Link is below.
http://uk.wii.ign.com/articles/947/947571p1.html?RSSwhen2009-01-22_153100&RSSid=947571
Edit: The game has been offically confirmed to be on the Wii & DS. Trailers are on youtube.
http://uk.wii.ign.com/articles/947/947571p1.html?RSSwhen2009-01-22_153100&RSSid=947571
Edit: The game has been offically confirmed to be on the Wii & DS. Trailers are on youtube.