We've released version 1.2.2 of the App Engine SDK for Python. Some highlights from the release notes:
- Urlfetch fetch now has support for user configurable deadlines.
- Datastore indexes on single properties can now be disabled by setting indexed=False on the property constructor.
- Datastore now supports Key-only queries, using either SELECT __key__ or db.Query(Model, keys_only=True)
- Bulk Loader improvements: New appcfg download_data command. Better backoff support and debugging output for long requests.
For a full list see the SdkReleaseNotes wiki page.