So it appears that Benedict Cumberbatch has been tapped to play Dr. Stange. I think it's a great move. He's pretty much the "it" character actor in genre films these days which will be a big draw and be a big help to the buzz about the movie (if it being a Marvel movie was enough of a draw factor alone). And he's a very solid actor (he does a great arrogant jerk, which will work particularly well for Dr. Stephen Strange, surgeon).
Marvel Casts Benedict Cumberbatch as Doctor Strange (http://www.comicbookresources.com/?page=article&id=56641)