Hmm. *rubs chin* What breaks it for me are those function keys - I just don't see Apple shuffling the Expose, Eject and volume keys around, especially when the keys they are currently on are still there. Why move the Eject key and confuse existig Mac users just to create a few extra function keys? The function keys are largely unused anyway, who wants F16-F19?.
And frankly it doesn't look like something Jonathan Ive would create. I still say either fake, or possibly concept/prototype.
Eta: And anther thing. See how the bottom row of keys are all slightly taller, including the keypad? The arrow keys aren't, they're the same size as the regular keys. It looks odd.