yeah i think this is the likely ending. i dont expect a happy ending on this one
Bane will break him pretty early on. A part of the film will show him ****, trying to work out what he needs to do to best Bane and trying to recover. Thats more or less a given now imo.
How it ends is more open to debate. Personally, as I've said, I think the recovered Batman beats Bane (+ whoever he's working with/for), but the effort is too much for him and he either dies, or has to give up.
Still not been confirmed to my knowledge if the new trailer is coming with the Avengers... I certainly hope so though, this might be the trailer were we get to see some confirmation of exactly what the plot is going be.