Since the news comes from a retailer listing, it is currently unknown if the release date is final or placeholder. Games tend to release on Tuesdays or Fridays in North America, but May 6 is a Thursday.
In Japan, Raiden IV x Mikado Remix is due out for Switch on April 22.
Here is an overview of the game, via Amazon:
Raiden IV, the popular shoot ’em up arcade and Console game, debuts on Nintendo Switch with remixed background music by a superb lineup of artists produced by Game Center Mikado. Instill fear in your enemies with devastating attacks and earn the acclaimed title of master Ace!
- New remixed background music produced by Game Center Mikado (exclusively on Nintendo Switch).
- A full suite of game modes including Arcade Mode, Overkill Mode, and more.
- Supports vertical screen play to recreate the full arcade experience.
- Global leaderboard to track the best aces in the world.
- Supports one to two players (offline).
Read more about the game here.