After a false start, we now know that Retro is tackling Metroid Prime 4 for Switch. Tons of fans were happy to hear this, but just who is still a part of Retro that has any ties to the previous Metroid Prime games? A bit of research by VideoGamesChronicle shows that roughly 50 people made up the core team for Metroid Prime 3: Corruption, and of that team, 27 remain at employed at Retro. Diving a bit deeper, 5 of Metroid Prime 3’s 11 designers are still part of the team.
If you go all the way back to the first Metroid Prime, we see that less than 10 members of the 40+ team still hold a position at Retro as of today.
Obviously, we don't know who at Retro is tackling Metroid Prime 4, and if any of the devs with experience from the previous entries are tied to the upcoming project. With that said, Retro rarely makes missteps, so I think it's safe to say that the game is in good hands.