I just checked my online puzzle shop.
THE 6X6X6 AND 7X7X7 RUBIK'S CUBES ARE NOW BEING MANUFACTURED FOR CONSUMERS :DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
They're currently out of stock, and they're pretty expensive, but I'm getting an arrival notice for the 6x6x6. This is so awesome, I've been looking forward to it for almost 2 years now.