The site that keeps teasing us with the "Brick" rumor has finally gave us two more clues. First, it's the "MacBook Brick". That means that it's probably a Mac tablet, a Mac netbook, or maybe even another laptops that's a step up from the MBP (unlikely, though). They've also posted another clue (this isn't the actual notebook, it's just a "clue" from them):
http://9to5mac.com/macbook-brick-riddle-3

http://9to5mac.com/macbook-brick-riddle-3