Nintendo of Europe revealed today that Mario & Luigi: Paper Jam will be coming to the 3DS on December 4, 2015. The game was first shown off at this year’s E3, and was teased with a 2016 release date. However, it was recently revealed that the game would be coming to Japan in December of this year, and now Europe as well. There is still no word on an updated North American release date.
The game blends the gameplay of the Paper Mario series and the Mario RPG series. We also now have an official plot synopsis for the game:
When Luigi accidentally opens a mysterious book hidden away in Peach’s Castle, he gets more than he bargained for when characters from the Paper Mario universe spill out of the pages and start running amok. Players must take control of the terrific trio of Mario, Luigi and Paper Mario to defeat Bowser and Paper Bowser and bring the Paper Mario characters back to their original world.
— Nintendo of Europe (@NintendoEurope) October 15, 2015