Here is the first trailer of the new episode of the Tales Of... series named Tales of Vesperia. Since it's a 720p video it's clearly not a Wii game, but no platform has been announced.
The source of the game's page on Namco's site had some interesting indications, since it had Xbox 360 listed in the keywords. Not an official confirmation, but still something.
From IGN's first look: "While Bandai Namco did announce that Kousuke Fujishima and Production I.G. would be contributing to the Vesperia Project, the trailer reveals another member of the development staff: Yoshito Higuchi. The director of Tales of Symphonia and Tales of Abyss, Higuchi is serving as producer and chief director on the new game."