The World Ends With You

Also known as "It's a Wonderfull World" in Japan.
It's an action-RPG for the handheld video game console, Nintendo DS. Developed by the Kingdom Hearts team, Square Enix and Jupiter. Designed by Tetsuya Nomura and Gen Kobayashi.
The North American title would be the as the Japanese, if it weren't due to copyright issues, but, in the meanwhile, it has been confirmed that the European version would be titled as "The World Ends With You" and the release date is set for Spring 2008.

I'll let here the Japanese cover, as we haven't yet displayed some info about it.

For some more information, click here to discuss the game on the forum.

Source: SquareInsider