You have *always* been able AirPlay content on your device to any Apple TV - no dreaming required. This is about content purchased from Apple but not on your device. Assuming this report is right, you'll now also be able to use AirPlay to view that material on someone else's Apple TV.
That is what I was referencing, should have been more clear. Those items you have in the cloud, not purchased, will you be able to play that also on another apple tv that is not yours? Songs you uploaded via itunes match etc.