According to an Australian rating board, Team 17 has a new Worms game in the works titled Worms Ultimate Mayhem. No platforms have been announced but most of their titles have been digitally distributed so that could possibly mean an upcoming XBLA release. Since Worms 4: Mayhem came out last-generation, the title might allude to the previous 3D game. Hopefully we see more about this game and find out more details and what platforms it’s coming out on during E3.
Source: Australian Classification