Experimental Datastore Backup/Restore
Using the Datastore Admin functionality in the Admin Console, you can now use the experimental Datastore Backup/Restore tool to backup your Datastore to Blobstore. You can also select a backup to restore from. The Datastore Backup/Restore feature runs as a MapReduce within your application and counts against your Instance, Datastore Ops, and Storage quotas.
Django® + Cloud SQL
For Python fans of Google’s Cloud SQL (currently available in limited preview), the long awaited out-of-the-box support for the Django framework has arrived and is now available as an experimental feature. Now you can easily use Cloud SQL within the Django framework as you would use any other SQL database.
Additional features available in 1.6.2 include:
Channel API: Developers can now specify how long a channel token will last until it expires, with the default remaining two hours. Channel API quota is now measured both in calls to create a channel and the number of hours of channel time requested.
Task Queues: A new X-Appengine-TaskETA header has been added which can be used to measure task delivery latency.
Blobstore: The Python API for the Blobstore now provides asynchronous API calls for creating upload URLs and fetching and deleting data.