It's funny, cause I was watching a Major Nelson interview where he was getting grilled on how Xbox One was (before today) supposed to have all kinds of crazy restrictions but none of the digital benefits Steam has, and his response was how Steam doesn't have the game sharing features the One will (would). Not really sure if this was a response to that.

Can't you just register your account onto as many devices as you want and play the library as long as no one is simultaneously logged in on another machine? Just seems unnecessary.