Princess Peach Showtime Hits Switch This March - Game Informer

The game was previously called "Untitled Princess Peach Game."

Nintendo Reveals Pink Joy-Con Switch Controllers Alongside New Princess Peach: Showtime Gameplay - Game Informer

Princess Peach: Showtime! Preview - Landing The Part - Game Informer

Game Informer's 300th Issue - Metroid Cover : r/NintendoSwitch

Game Informer

Princess Peach: Showtime! Preview - Landing The Part - Game Informer

Kingdom Hearts Melody of Memory Preview - Our Biggest Kingdom Hearts Melody Of Memory Questions Answered - Game Informer

Japan: A Happy Birthdays Demo Is Coming To Nintendo Switch March 22nd - My Nintendo News

Princess Peach™: Showtime! for Nintendo Switch - Nintendo Official Site

IGN - IGN added a new photo.

Princess Peach: Showtime! - Official Announcement Trailer