I'm also getting the impression that Joseph Gordon-Levitt will be taking over the Batman once Bruce either dies/becomes paralyzed. Perhaps, as a Gotham cop he figures out Bruce is Batman but keeps the secret to himself and Gordon and decides to don the cowl once Bruce is injured.
The thing that interests me, though, is if this happens will Levitt be a replacement Batman or a psycho Batman like Jean Paul Valley? I guess that'd be reason for the Bruce Wayne Batman to "Rise" to defeat the imposter Batman.
All I know is, I can't wait to see this frigging movie!