Metroid: Project S is a Metroid game for the Cryogon. It was developed by Nintendo alongside Retro Studios and Pyro Enterprizes. Not much is currently known about the game, though it is known that the game will return to the series' 2D roots and introduce several new characters to the series.
The story is stated to take place within an alternate timeline where Samus was raised by the Space Pirates as opposed to the Chozo. Not much else is known at this point in time.
Several types of online multiplayer modes are said to be in development, though the exact specifications are as of yet unknown.