I have a feeling the names circling around for the past 7 to 8 years will get second consideration.
People wanted Cavill for Superman Returns.
So far i've heard
Ian Somerhalder- Batman
Matthew Bomer- Another contender for Superman
Michael C Hall- Luthor
Jim Caviezel- Batman and Superman
Those are the few that keep popping up.
Cavill was McG's Superman.
Just like Matt Bomer was Brett Ratner's Superman.
Cavill was also up for Twilight and Casino Royale.
I think Jim Caviezel would make a great Batman, especially after seeing him in Person of Interest. He's already got the voice down pat!
Caviezel might be the longest shot considering he's on a full-season TV show that requires 8-9 months of shooting. The ones on cable TV (Bomer, Hamm, etc.) would all depend on where their TV shooting schedule lines up.