Based on the responses to the Related pages RFC and the discussion on the related pages talk page, a proposal is going out to roll related pages only on the mobile web and to disable on the desktop beta.
I think members of the German Wikipedia voiced an interest in not having this feature, so it will not roll out there.
We will roll out on a few wikis at a time, starting with smaller ones. If you do not want your wiki in the first batch, comment below.