Metroid Prime Trilogy and begun to enter Full Excitement Mode™ for next year's Metroid Other M, but there could be even more Metroid in store under Prime's banner of first-person action. Nintendo's Kensuke Tanabe, who oversaw development on the Prime games for Nintendo at Retro Studios, recently told ONM that Nintendo is "always planning to make new games in the Metroid Prime series."
Tanabe didn't speak of a continuation on Wii, but noted that depending "on the timing and the situation, we cannot deny the possibility of realising it on DS or DSi." Though Retro hasn't isolated itself from the franchise, we know Nintendo isn't shy about sharing Samus with external developers. Just don't call it "Metroid Dread," guys. Bad memories.