Its been mentioned several times that the producers have a certain actor in mind - Wagner stated a while ago:
I'm not at liberty to name names....but the one I've heard suggested seems an excellent choice. He's got the looks and he's got the voice.
I've heard vague rumours about two particular actors -
Gerard Butler and
Thomas Jane.
Out of the two, Jane seems the more likely option - Butler is quite a big name these days so is probably out of their price range. Personally I think that's a good thing - he was fun in
300, but the guy can't do a decent American accent and he's been in quite a few stinkers lately.
I haven't seen Jane in anything, so can't really comment, but on the face of it he seems a pretty good choice.
Those that suggest
Jason Statham need their heads examined (sorry bluemeanie!) - he would be an awful choice and like Butler can't do the accent.
My personal preference would be
Ron Perlman, though again he might be too big a star, and he might also be considered as too old.