Tetris watch
Designed by Lysandre Follet, this watch plays Tetris. It's not entirely clear if it's for real, as the artist's site is down and it's hard to imagine the Tetris trademark getting onto things without other corporate livery following it there. If it is, it's clearly going to be released by Nixon—guys who do a mean line in retro wristwear.
Update: Commenter Frankiez points out that it was up at Yanko ages and ages ago: Tetris Pong Forever.
Retro watch [Radeville via Trendhunter]

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I dig the white pixels instead of the abrasive cheap red LEDs.
Sorry to burst your bubble, but it appears to be a design only. Here is the artist's site - it says "9/27 Tetris Forever & Tele - nixon concept - solidworks + maxwell render". It's also at least a year old & no product yet. He's also done concept watches branded with Nooka and Ripcurl, which are pretty neat, but also seem to be just renders.
Ops, this is a concept design from Yanko Design made in 2007:
http://www.yankodesign.com/2007/11/15/tetris-pong-forever/
Updated!