Trine has been a pretty beloved franchise over the years as a fun platforming puzzle game with RPG elements. You played as three different characters that could be swapped between whenever you like. When one of them perished, you could still play as the others until you brought them back to life. The game has also supported coop play, which makes it a fun game to play on the couch!
Trine 4 will be the next installment of this game. It is called "The Nightmare Prince" and looks to feature a lot of the same core gameplay. It also appears that they've gone back to the traditional 2D focused gameplay, where Trine 3 had parts that went 3D. The overall reception to those parts were not positive, so hopefully the developers learned their lesson.
Trine 4: The Nightmare Prince Trailer
Here's a bit more information that's been provided by the official website:
Trine returns in 2.5D!
Explore uniquely designed levels in beautiful 2.5D, from breathtaking ruins to tranquil birch groves.
Local and online multiplayer
Play with up to 4 players online or in local co-op.
Follow the story of a haunted prince as you journey through magical fairytale landscapes inhabited by nightmarish foes.
Solve environmental puzzles with challenges tailored to the number of players.
Completely revamped combat system
Tackle enemies and boss fights with an enriched combat system, fresh challenges, and thrilling action!
Abundant skill trees
Unlock diverse abilities and amazing new skills.
Enjoy a wondrous soundtrack with songs that bring life to each new environment.