My first reaction was that it makes sense since Nolan and crew have been talking about having their story "come full circle" and whatnot. I am a little worried about this going the same route as a lot of comic book threequels and having too many character arcs to do them all justice. I'd really like to see a fully fleshed-out Bane arc take the center stage. We'll see I guess.
Also really interested in how they plan on explaining the Lazarus Pit without going too supernatural. I suspect that if Bane busts up Batty like he did in the comics this could be used to explain how Bruce Wayne recovers as well as how Ra's survived the first movie. There's apparently a lot of speculation that Bane will be a part of the League of Shadows, but I hope it doesn't go that route.. Bane should be able to carry himself in this movie. Catwoman on the other hand...