That's a lot of Kirbys!
Kirby 64: The Crystal Shards, was previously announced for the Switch Online Expansion Pack, but now we know the game’s official release date. That information came with the trailer you can see above. We now know the game will be added to the N64 app come May 20th, 2022.
A new Japanese trailer for Kirby 64: The Crystal Shards was also released on Nintendo’s YouTube account. You can check out that version above as well.