According to a Mircosoft spokesperson:

It was originally planned for the Xbox One to be a set-top box of sorts in addition to being a game console, letting users schedule recordings on the go and stream or download shows to Windows 10 PCs and mobile devices. While that feature would have been quite useful, Microsoft would keep it limited to free-to-air TV. There would also be digital TV tuners that support the feature released in Europe and the US.

Upon the end of Windows Media Center for Windows 10, it seems like this plan got axed along with it, as there are no other alternatives at the moment. Due to this development, the Xbox One is back to its full status as a gaming console. Whatever we may get to see at E3 2016 related to the Xbox One, it will most likely be gaming titles and hardware.