Deadline reports another reason Warner Bros. has put Akira on hold is that they can't figure out who should play Tetsuo and the actors are free to walk from the project if they want to. The two actors in question are Michael Pitt (Boardwalk Empire, The Dreamers) and Dane DeHaan (In Treatment, True Blood, Chronicle) their testing options have expired so they are currently free to go after other projects.
The character is basically the meatiest role of the picture as Tetsuo goes from nerdy gangland biker to a psychotic villain with overwhelming superpowers. Yet, I'm unsure what bastardized version of Tetsuo we'll end up seeing in the film since Kaneda is now a bartender/bar owner instead of a punk biker. Out of the two I have to go with Pitt as he's been wonderful on the first two seasons of Boardwalk Empire. However, Dane DeHaan's upcoming superpower film Chronicle is gathering a lot of buzz.