Are certainly not miss demonstrations of various features of the Xbox One during the announcement of the console, however it seems that some lacked the appeal. According to an anonymous source Polygon site, there would still be two functions to be announced: text-to-speech remote play.

Thanks to the text-to-speech Kinect would be able to recognize the player and talk directly with him, giving him welcome, for example, during logon or asking others to identify if there are any people not registered previously. According to the source, this function may not be available at launch, but will be added later by an update.

The remote play functionality is substantially similar to what has already been announced for PS4: thanks to this function a friend can take control of our game (of course after you have authorized) and play at our place from his console, helping for example playing himself a section that we couldn't overcome. The Polygon source specified that he had witnessed a demonstration between two connected console locally, but that Microsoft is not worried about possible problems of lag between console connected online; the technology of all should be the video-communication protocol of Skype, which provides good performance even with network connections, not too fast.

It only remains to wait for official announcements.