im sure its possible, but I don't think that sony or Microsoft want that to happen, because they sell more consoles when people want to play with their friends and can only do so on the same gen. I don't think this is a big problem tho because you my next-gen friend can always bring your account back to the old system (if you still have it) and play with your 360 friends. im just happy they let me take my account to the new system.(a lot of time would have been wasted)