An Ubisoft forum member has posted what appears to be an in-development screenshot of an unannounced Prince of Persia game.
The unverified screenshot includes a watermark labelling it as Prince of Persia Zero, a codename used by Ubisoft for a PS2 game which would have taken the prince into the modern era. it was cancelled, so even if the screenshot is genuine, it may be something dug out of the archives rather than indication of a new game.
That said, we did get a bit of a tease back in May, although the lack of a hoped-for E3 reveal suggests someone might have been yanking our chains.
The last Prince of Persia games were a 2008 effort for PlayStation 3 and Xbox 360, which rebooted the series again following waning mid-2000′s success, and The Forgotten Sands, a 20120 multi-platform affair ignoring the second reboot and tying in with the Hollywood film.