User blog comment:LIGHTNING HAWK/new characters/@comment-184.101.17.101-20140326030447/@comment-5367080-20140329094352

They don't even come from the same Universe at the moment, comic wise maybe, but the Nolanverse is purely the Dark Knight trilogy, if there is going to be a shared universe it will be one with a Ben Affleck Batman and a new range of actors taking on the roles of Batman's enemies in new stories.

Ra's if he appears will have to be a new actor with absolutely no relation to the character portrayed by Liam Neeson. Or at least thats how I am hoping it will be :P