According to rumors (yes, lots of rumors today), ND Cube, a subsidiary of Nintendo, is working on Mario Party 11. The game is targeted for a 2019 release on the Nintendo Switch.
The last Mario Party game on a Nintendo home console was Mario Party 10, released in 2015 on the Wii U.
That game wasn’t well received by fans and critics, and is one of the lowest rated Nintendo games of all time, with a Metacritic score of 66.
ND Cube are developing Mario Party 11 for the Nintendo Switch and is scheduled for release in 2019.
— Marcus Sellars (@Marcus_Sellars) February 3, 2018