I tried to replicate the related content block I made on Poligo, but to no avail. I found that these comments were most helpful in getting it done: First steps: https://www.drupal.org/node/2156975#comment-11635855 A tweak: https://www.drupal.org/node/2156975#comment-11804853 To exclude the current node: https://www.drupal.org/node/131547
The workflow transition event is gone from Workflow 2.0. This thread explains how to react to a check for transitions.
Posting to myself to remember this thread from Drupal on how to patch. https://www.drupal.org/node/1904234