Small preview (some spoilers):
In this highly anticipated sequel to Metroid Prime, become the bounty hunter behind the visor once more and travel to a planet torn into light and darkness. Hunted by a mysterious entity and a warring race called the Ing, Samus Aran must explore the light and dark worlds of this doomed planet to discover secrets and augment her suit's weapons and abilities.
And now, for the first time in the history of the celebrated Metroid franchise, up to four players can battle each other as they search for weapons, grapple across ceilings, and turn into Morph Balls to make their escapes.
--end spoilers--
More images on the nintendo site:
Nintendo