GameTrailers forum, although it's unclear if the poster was who genuinely took it.
Destructoid posted a photo yesterday of a similar-looking prototype controller, with the same rounded sides, differently shaped analog sticks, and what's apparently a small touchscreen at the top. The previous photo also showed a bar with a similar glow to that of the PlayStation Move, suggesting the controller has motion tracking built-in. Sources at IGN indicated that photo was the real deal, but that it was of an early prototype.
We may know more about the next PlayStation console and its controllers following next week's PlayStation 2013 event, where Sony's expected to announce the PS3's successor.