I would love to see a an external GPU utilizing TB2 for the rMBP. Who else would be interested in such device? I know right now these do exist, but they are home made. Would be great if we could get a high end Dedicated GPU in an external enclosure, even make it user upgradeable. With TB2 we should be able to utilize all 16 lanes . I know some companies have mentioned this, but I don't believe they ever released anything. Just a pipe dream I guess, but what a way to make an impact on mobile gaming scene. rMBP or Air with the ability to use a 780m GTX, I'm sure it could be done. I'm also thinking companies are just to worried about sales decline over providing the public what they want.. High end mobile GPU with internal power supply and a TB2 connection. Work and game on the same system.