Rumors that Sylvester McCoy, the former Seventh Doctor from Doctor Who, is going to be in the upcoming screen adaptation of The Hobbit have been circulating for a while now. Some have speculated that McCoy is going to play Bilbo Baggins, the part he previously lost to Ian Holm in the original Lord of the Rings trilogy, but it seems more and more likely that he will be portraying Radagast the Brown instead.
According to an article posted on TheOneRing.net, they received a "spy report" claiming that McCoy has verified his casting as Radagast:
My brother works at Katmandu in the city (Melbourne) and who should walk in looking for appropriate attire for New Zealand but Sylvester McCoy! He was more than willing to discuss The Hobbit, and is indeed playing Radagast the brown. He said he was “some wizard”, to which my brother offered up “Radagast the brown?” and Sylvester said “Yes, that’s it!”. He then confessed he couldn’t find him anywhere in the book. Unfortunately my brother isn’t as big a fan as myself, so didn’t give Sylvester the grilling I certainly would have! He did offer up this interesting tidbit, though: He was pipped at the post by Ian Holm to play Bilbo in the original lotr trilogy!
Obviously, a spy report (especially by someone using the alias "Viggo Yearning") isn't official confirmation by any means, but it does add a good bit of fuel to this particular fire. Supposedly, Radagast's part has been beefed up for the film adaptation, so hopefully this means that another previous Doctor would get to appear in a major motion picture. It's certainly been a while since that young upstart David Tennant was Barty Crouch, Jr. in Harry Potter and the Goblet of Fire...