This morning at 6am EST, Google's Mariya Moeva, John Mueller and Krzysztof Muzyka (I believe that his last name), conducted an hour long hangout starting with a presentation on how Google handles App Indexing and then answered dozens and dozens of questions.
I highlight recommend you watch the Google Hangout on Google+ or on YouTube. There is nothing new released in the hangout, but it is a great overview of common questions that get answered in the video.
Here is the video embed:
Forum discussion at Google+.