This is for Active Directory Federation Services on Server 2016 Technical Preview 5.
This is the last TP before RTM.
I've done a series of posts on this capability in TP4 and I tried a few of the use cases in TP5 and they worked no problem.
All you need to do is to change the metadata URL and the clientID and the secret key.
So much easier when you have a working sample as reference :-).
There is a similar series of Microsoft posts here. I believe that more content is going to be added prior to RTM.
The format of these posts is somewhat different to the way that I do them but I will leave you to decide which way you prefer!