The last proper Metroid Prime title was released in 2007 but another is on the way almost a decade later. Metroid Prime 4 was officially announced by Nintendo at their press conference.
According to series producer Kensuke Tanabe, “Metroid Prime 4 returns to the First-Person Adventure roots of the original Metroid Prime game.” Further, its storyline will “tie together the events of the Metroid Prime universe” while taking it in new directions. Prime 4 is in development for the Switch.
Beyond these facts, fans may speculate.
Experiencing what Nintendo did with Zelda: Breath of the Wild, an open-world Metroid Prime would be delicious. Of course, Metroid has been open-ended from the start, but not Breath of the Wild open. Prime’s gameplay systems – power-ups, scans and log entries, non-linear exploration, puzzles, and different environs requiring different suits – would complement well an open structure like the one in the latest Zelda or in titles like Fallout 4.
But this is just speculation – fans must wait and see.
For now, you can see this: