Nobody was supposed to film any footage of Samus' next adventure, but hey, this is the Internet.
The Examiner has posted some leaked footage of Metroid: Other M, recorded at last week's Nintendo Media Summit.
The footage seems to be a recreation of the end of Super Metroid, when a baby Metroid gives its life to Samus in order to allow her to defeat Mother Brain. In a continuation of the story, Samus wakes up in a quarantine unit of a hospital, and some rather uninspired voice acting ensues.
Metroid: Other M ships on June 27 in North America.
Update: The footage has been removed from Youtube, but this is the Internet, and the footage can now be found at The Metroid Database