Just a reminder that I have a live webcast tomorrow (Tuesday) morning at 10am PT, entitled, "Data Modeling for Google App Engine using Python and ndb." I intend to keep the datastore material somewhat introductory, but all code will use ndb and Python 2.7. Hopefully there will be time to highlight a few of the major features that are new to ndb (over ext.db).
Also: Programming Google App Engine, 2nd edition, will be out for real this month! Early Access subscribers will get the final ebook, and print pre-orders will ship. Amazon.com is showing a release date of October 26.