Orange Lounge Radio has dug up some info on an alleged new entry into the Katamari universe. Entitled Beautiful Katamari, OLR claims that the game will be making its way to the Xbox 360 and the PS3, with appropriate SIXAXIS support, this October. A Wii version is to follow shortly thereafter, sometime in November.
While this hasn't been confirmed by Namco, OLR backs up ther claim with a recent Beautiful Katamari trademark as well as video game distributor sources of their own. Still, until an official announcement, take this rumor with a grain of salt.
In the meantime, take a gander at the food katamari I made back in 2005.