There was an excellent Google+ hangout with Google's John Mueller on the topics of mobile, AMP & App-Indexing. He started with a presentation and then spent the rest of the hangout answering questions. There isn't much new there outside of some questions around what may happen in the future around the Search Console and the data there with AMP and App Indexing. Like will Google potentially show app install data from Google Play in the Google Search Console?
The video is well worth listening to, even in the background, because it touches on many new topics as a refresher.
Here is the video embed:
Forum discussion at Google+.