User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-432124-20120716061112/@comment-432124-20120716213222

However, Keith David voicing Despero is possible. He voiced Despero on Justice League, so he could be willing to reprise that role. Also, according to this: http://en.wikipedia.org/wiki/Greg_Weisman#Recurring_collaborators, Keith David is one of the only four Greg Weisman collaborators who haven't been on Young Justice so far, so I'm pretty sure that he or at least another of said actors would be willing to work with Greg Weisman again.