So... who is Tom Hardy going to be? My guess is that this film will be about the symbol of Batman, the idea of it all, being corrupted by all that has occurred in the past. Now, Batman's the bad guy in the public eye (save for a few believers), that places the new guy to be either a) a 'vigilante' who's out to kill bats and do the "right thing", b) a villain who understands that dilemma (Catwoman is the best archetype here), c) a member of the Falcone family, d) another new 'freak' that's overrun the city, or e) a villain never before seen in live action.
Here's the list of possible 'Tom Hardy' roles I can think of (if he's a villain):
Jean-Paul Levisque, aka, Azrael
Bane (Batman & Robin doesn't count)
Hush
Alberto Falcone
Killer Croc (all cannibal hector-esque) or
Paul Sloane (aka THE CHARLATAN, aka that obscure, Harvey Dent lookalike w/ties to Jonathan "guys I'm the ONLY other living supervillain in the batman films!" Crane)
This list ain't exhaustive.