The head of Xbox, Phil Spencer was asked on Twitter when an 'Xbox One Windows 10 Beta' might become available.
His response: "It will be post-summer." Now that doesn't exactly fill in all the gaps in our knowledge about what Windows 10 will look like on the console, or what features will (or won't) be included. Indeed, all it really tells us is what we already suspected: that the company will be focusing primarily on getting the OS ready for its summer launch on PCs, before it then turns its attention to other devices.
@dave125norco It will be post-summer.
— Phil Spencer (@XboxP3) May 19, 2015
Source: Neowin