Goblin Menace will include a new campaign consisting of six new stages, and a host of new skills playable in both the expansion and original game. Also, it presumably includes goblins doing something menacing. It's set to hit PC in the fall, and will be included in the Wii U "Director's Cut" version of the game. Pricing and release information haven't been announced.
"Trine 2: Goblin Menace is an expansion that we wanted to cultivate with a lot of time, effort and love," said Frozenbyte CEO Lauri Hyvarinen, in the announcement. "We feel this expansion is our best work to date."