Those are part of the 2010 Olympic (and Paralympic) series. There will be a total of 12 quarters minted. 10 will commemorate Winter Olympic sports, and the other 2 will commemorate Winter Paralympic sports. So far we 5 of them have been released. Two of them have already produced mules. The most recent one was the Alpine Skiing that should be dated 2007, but some were released with the 2008 date. None of the mules were released for circulation, as all were restricted to mint sets, and special issues. I forget what the other mule was, but it was an olympic sport with the paralympic obverse. Again, not the circulation releases, though.
As if that wasn't enough, there will be Lucky Loonies released in 2008 and 2010 with the olympic logo on them. This isn't really anything new as they did the same in 2004 and 2006 so far. The interesting releases, though, will be the set of three quarters that will be chosen by the public to honour a gold, silver, and bronze medal event (or individual) in 2010. These quarters are also supposed to be gold, silver and bronze coloured. I don't suspect we'll see too many of them circulating.