Amazon's French site may have leaked the news on the latest entry of Ubisoft's smash dance series.
Amazon France has accepted pre-orders for what seems to be the fourth game in Ubisoft's Just Dance series. Ubisoft has yet to confirm the existence of a fourth game, but due to the series' yearly game releases, all signs seems to indicate that this will be a reality.
The interesting thing about this rumor, though, is that Amazon France is only taking pre-orders for the Wii version of the game, indicating that if Just Dance 4 does come out, it will be only for Wii. Last year, Just Dance 3 made its debut on the Xbox 360 as a Kinect title and on the PlayStation 3 using the Move controller. The Wii version of the game managed to outsell both versions, likely inspiring the rumored decision to make the fourth game just a Wii effort.
Regardless, until Ubisoft confirms or denies the existence of the game, this is strictly a rumor.