Justice League Batman cast?

IESB is reporting with some authority that Batman has been cast for the George Miller Justice League film. And who is it? Armie Hammer. No really, who is it? Hammer, a relative unknown, has been seen in Flicka, Desperate Housewives and Arrested Development, so yeah, he's pretty unknown. But he does clock in at 6'5" and, according to IESB, is an amateur magician (no word as to whether or not he's part of the Magician's Alliance or not). Batman-on-Film first reported this about a week ago, but it was more rumor than anything. IESB swears that they're reporting this with credibility, so take that for what its worth. Hammer confirmed as Batman?