The sequel to the Wii game De Blob is called De Blob: The Underground and will be released during the spring next year, all according to Nintendo Power.
The game is under development for both Wii and DS, and takes place on a tropical island that has been ruined by the evil ruler Comrade Black. De Blob will have a couple of new moves in his arsenal, and will get to play on a couple of 2D levels. It will also feature a co-op mode.