Developers of Trine 4 have recently announced the advent of a new DLC dedicated to the title. The additional content, which will be called Melody of Mystery, will be made available during the next spring.
"With a suspicious and loose spirit, Amadeus, Pontius and Zoya's journey will take them through six new levels, where they will master enhanced skills by solving new puzzles based on elements such as ice sheets, torches, magnets and crystals."
Within the DLC, the three heroes will return to the Astral Academy to investigate and solve the mystery of the eternal sleep that seems to have affected all students. The content, according to what the guys from Frozenbyte, Sara strongly story driven. There will then be the canonical puzzles spread over six levels.