There's also some new stills, more of which you can see over at Batmannews.com at the link below.
Batman: The Dark Knight Returns, Part 2 picks up where the first left off with Batman having returned to Gotham with an all new Robin, however not everyone is welcoming him back to the streets. Gotham City's police are on a manhunt for the Batman as is the newly released Joker. As Batman attempts to stop the Joker one last time, the United States goverment teams up with Superman to bring the Dark Knight down for good.
Peter Weller returns as the voice of the aged Dark Knight along with Ariel Winter as Carrie Kelly, the new Robin. "Lost's" Michael Emerson provides the voice of the 'cured' Joker and Mark Valley will play the Man of Tomorrow, Superman.