Looks like maybe I can designate 10 friends as family and share games between all of them.
Also you can access your entire Xbox One library from any other Xbox One. Hoping that expands to any Windows 8 machine or tablet that meets certain requirements or something too.Give your family access to your entire games library anytime, anywhere: Xbox One will enable new forms of access for families. Up to ten members of your family can log in and play from your shared games library on any Xbox One. Just like today, a family member can play your copy of Forza Motorsport at a friend's house. Only now, they will see not just Forza, but all of your shared games. You can always play your games, and any one of your family members can be playing from your shared library at a given time.