Metroid Prime 3: Corruption, is taking a break from the series.
As the game's director Mark Pacini told Yahoo in this video interview, "We are taking a break from the Metroid series and from Samus, I'm sure there will be other titles created, but, as far as Retro Studios is concerned, we're taking a break for a little bit." Listen Retro, we're sad to hear it, but you just made three games, we understand. In slightly more chuckle-inducing news, can you believe the team didn't know about the Wii control scheme until they were 9 months into development? Oh, what we would have given to be a fly on that wall.