Bruce will be back as Batman. That's pretty much a done deal. That being said I'd really like to see Grayson play the role for a year or so. It's been a really interesting ride so far, and I think the momentum is enough that they could easily keep this going for another year or so.
It's funny. I went by a DC comics forum not too long ago to see some of the reactions. Most fans seem to be really enjoying this whole thing, but the ones who didn't like the storyline had some pretty hilarious posts going.