Monster Hunter Generations Ultimate will be released for Nintendo Switch on August 28th, making it the series debut on the console Capcom has confirmed. The game is a follow on from Generations and will include an entirely new area for players to attempt to take down beasts in. Capcom has also stated that Monster Hunter Generations Ultimate has the largest roster of unique monsters in the series.
Those who have save data for Monster Hunter Generations can transfer it to Ultimate to continue your progress.
Source: Press Release