In terms of the Xbox One you can share your game library for free digitally with up to ten people. Though the caveat is that each of you will need to be "always online" as your only allowed 1 hour of being offline when playing each others games. The amount of internet bandwidth will be massive for those who have to monitor their monthly use. So this feature is rather limited for a lot of people.
There are a lot of compelling features about the Xbox One, but there is usually a catch involved.
But playing a FPS and things like touching your temple enables night vision on your character is awesome.
With Forza 5 they are eliminating computer AI for single player through cloud computing.
