I recently read The Hobbit again too. I imagine the talky scenes with the dragon will be the equivalent of the Gollum scenes in part 1 ie. the best bits. I'd forgotten how briefly Smaug is in it, a quick chinwag with Bilbo, a sortie around the mountain, then the Black arrow in his chest over Lake Town. They're blatantly going to drag it out over the final third of pt 2 and first half of pt3 though.