Nintendo has updated it's website with a new game to be released November this year: Return to Castle Wolfenstein. Allthough there has not been an official press release yet, it is known that quite a few titles appear on the Nintendo website before they get officialy announced.

Need proof? No problem, just follow this link: Nintendo Games List
Thanks to booser at the GameCube Europe forums for the heads up. More first person shooters for the GameCube, awesome!