No warranty, we don't recommend this, etc. etc. Your machine may explode into 101 pieces. Do at your own risk. etc. don't be mad at us. :-)

SteamOS 3.0 (codename: Clockwerk) will happen as stuff is being turned off packages wise for Stetch like backports etc.

From what I understand they are down to 1 solid Linux dev. according to this:
https://www.gamingonlinux.com/articles/looks-like-steamos-30-is-on-the-way-codenamed-clockwerk.12208/page=3#comments

Pierre-Loup is still there yes, but jvert is gonne.

Since we know it is coming, as a small studio we want to have everything written for what will be, not what was and is now outdated and possibly broken.

What will be:
http://repo.steampowered.com/steamos/dists/clockwerk/non-free/binary-amd64/Release

Also, if you have AMD GPU you can do it all on Clockwerk without non-free! (in theory)

Distro Upgrading can be a hot mess. We will try to add some sanity to it.

More soon...