All the little clues Bruce leaves in "Rises" would lead people to believe that Blake is the new Batman, he gave him the coordinates to the Batcave for fu*ks sake. However, I am inclined to believe that Blake will be Nightwing, guarding Gotham until Batman returns. Even the "bat sign" on the ligh projector thing at the end looks like that of Nightwing if you guys payed attention.
So I dunno, we'll see. Honestly, I respect his decision to want to end on a high note, but the way ended this movie opening the doors to new adventures, it's like a huge fu*king c*ck tease. It would be sad to not want to do it. At least Produce it and have your brother write it, if you don't want to direct it.....that's my 2 cents.