Armie Hammer of Lone Ranger and Social Network fame is rumored to be in talks for the Batman role in WB's unanounced Justice League film. It's worth mentioning that he was cast as Batman in George Miller's canned Justice League: Mortal project. With a strong jaw and 6'4" height, Hammer could be an inexpensive casting choice for what is sure to be a multi-hundred-million dollar film. He's about the same age as Henry Cavill, so the two of them could age well together as the Justice League franchise churns out films.
Hopefully fans do not overreact. Chris Evan, Hugh Jackman, and Scarlet Johanssen have all done well in roles fans couldn't see them in. And having a lesser known actor is not only good for the budget of the film, it's also good for the character the actor will portray. Chris Hemsworth IS Thor just as much as Christopher Reeves IS Superman.