French developer Atelier 801 has recently announced Transformice Adventures, a new multiplayer action-RPG and it's coming to Linux sometime later this year.
Set in the same world as their older MMO title, Transformice, a game which I had never heard of until recently but it seems a lot of people enjoyed it (with over 100 million registered users) so it will be interesting to see if many come back for something a little different. They're saying their special Job system (like RPG classes) will do something a little different, giving you additional ways to influence fights which sounds interesting.
From what they've said, it's going to go through a Kickstarter campaign next month so we will let you know when that launches. They've fully confirmed Linux will be a platform for release, just like their previous game Dead Maze although I do hope they're using more modern tools to build Transformice Adventures as Dead Maze suffered a bit due to the use of Flash.
You can wishlist and follow it on Steam.