hype-kaminari-kun:

Did you Know? The same singer of the first opening “Hoshi no Kaabi”, also sing the new them “super smash bros ultimate” in japanese version.

Also another trivia: 

“(World of Light Japanese name) 灯火の星 backwards can be read as ‘Hoshi no Kaabi’”

…. Basically this new adventure mode is “Kirby of the Stars” the game.