Page loaded using SPDY

After upgrading to windows 8.1, i noted the message in IE that facebook had been loaded using the SPDY protocol. Pretty interesting, as I recall when this was just some theoretical ideas that google was throwing around, I had no idea it had alrady progressed this far and was actually being implemented by the major browsers. It looks like most or all of the major browser versions now support SPDY and a number of the larger service prodivers are supporting it server-side, such as google (gmail etc), facebook, etc. Twitter was an early adopter as well. 

What is SPDY? read a bit more here https://developers.google.com/speed/spdy/

So now I’m curious if IIS will implement this, or perhaps it already has in the newest versions?