Update: Ubisoft have confirmed the existance of the Prince of Persia Wii port, now known as Rival Swords (which was rumoured for the DS earlier this year after being trademarked). The game makes extensive use of the Wii Remote and Nunchuck for some classic Prince of Persia action.

More screens can be found in the screens album below.
Here are some official details, courtesy of Ubisoft:
About Prince of Persia Rival Swords
The Prince of Persia makes his way home to Babylon, bearing with him Kaileena, the enigmatic Empress of Time, and unspeakable scars from the Island of Time. But instead of the peace he longs for, he finds his kingdom ravaged by war and Kaileena the target of a brutal plot. When she is kidnapped, the Prince tracks her to the Palace