A6 processor for the AppleTV? Not really sure what they could do with it... without a major software update.
Framerates. It has no current support in its hardware for variable framerate output... not just newfangled stuff like 48fps in The Hobbit, but the standard 24fps movies have featured for a while now, which blu-rays and all digital files are encoded at, and any $40 BR player can play, provided your TV supports that framerate, which an increasing number of televisions do. Additionally, this is what will be necessary for 3-D support, moving forward.
Right now, if you play an iTunes HD movie file, the 24fps file is telecined out to 30fps on the fly, increasing judder and reducing smoothness to no real benefit except maintaining sync compatibility with legacy displays. And if there's one thing we can safely say about Apple, it's that they don't give a damn about supporting legacy hardware one minute longer than they have to.