Update 2: Official site is up with screenshots.
Update: Microsoft has revealed new details on their Xbox Wire news page.
‘Ori and the Blind Forest’ tells the story of Ori, a Guardian Spirit, who, at birth, has been cast away from his home. He grows up with Naru, his ‘stepmother’ and lives happily with her until the forest suddenly decays. After that, Ori has to venture out and find out more about himself. It’s a coming-of-age story, really. It’s an allegorical tale about responsibility and making sacrifices for the ones we love.
Back in March, Microsoft trademarked a mystery new title. Today, during their E3 conference, Microsoft revealed Ori and the Blind Forest, an Xbox One console exclusive and Metroidvania-style adventure developed by Moon Studios in conjunction with Microsoft Studios.