I have not seen these mentioned on the site before, I did a search.
They are programmable cubes that use NFC (Near Field Communication), I wonder who will be the first to write a Rubik (or other twisty) style simulator or game for these!https://www.sifteo.com/cubes
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Note: There are two versions, version one requires a PC to play. Version two does not but is currently out of stock, however I believe that's temporary.
You can read about the SDK here:https://www.sifteo.com/developers
And download it here:https://developers.sifteo.com/download