YA Bliss, there's the YA Historical Fiction Challenge with three levels--the first requires you read five books; the second requires you read 10 books, and the third is for readers ready to tackle 15 books. Books don't have to be 2012 releases, but they do have to be YA or MG.
Just to get you started, there are several lists of YA Historical Fiction available.
Over at Historical Tapestry, they're hosting a 2012 challenge in all categories of historical fiction, including fantasy and YA. This challenge offers five levels of participation, for readers who only have time for two books up to readers who plow through 20.
The International Reading Challenge began earlier this year but runs through June 2012, so there's still time to participate. Check out the video for the event here. One of the sponsors is The Breathless Quills, which reviews books from different countries. Check it out here.
The coming year, 2012, is apparently the "National Year of Reading," so do your part!