From 4Chan. Take with a grain of salt. Based on the rumors, seems like we will be getting an announcement sometime in the summer months (E3, Gamescom or an Xbox Event). :
XBOX of the Future. | 4chan | Know Your Meme
XBOX of the Future. | 4chan | Know Your Meme
Warning over 4Chan Xbox One prank - BBC News
Brand New 4chan leak claims to play the sgf demo : r/SonicFrontiers