I saw this announced by several different people over on facebook and clicked on one of the links for more info. Author Patrick Rothfuss and artist Lee Moyers have joined to create this calendar, which is a fundraiser for Worldbuilder, a non-profit founded by Rothfuss.
Twelve popular and big-name authors have agreed to lend a character to the project and the cover is HAWT. Check it out.
The calendars won't ship until November but you order now and there's a discount for ordering two or more. Click here to order.
List of authors participating
Peter S. Beagle
Patricia Briggs (Mercy as a pin-up girl! Can you imagine? Mercy would NOT approve, lol)
George R. R. Martin
Go! Order! 2013 will be here before you know it.