We just announced App Engine 1.5.3 SDK release on the official blog:
http://googleappengine.blogspot.com/2011/08/app-engine-153-sdk-released.html

You can download it from here:
http://code.google.com/p/googleappengine/downloads/list

See the Release Notes below, Happy Hacking!

App Engine SDK - Release Notes

Version 1.5.3 - Aug 17, 2011

Python
======

We've removed the limit on the size of blob uploads using the Blobstore API.
You can now send emails with any attachment extension that is not
included on the email attachment extension blacklist.
Added a db.get_indexes() method to retrieve an application's indexes
and their corresponding states.
The dev_appserver has been updated to understand the reduced index
requirements of the 1.5.2 datastore query planner changes.
The Datastore Admin functionality can now be enabled directly in the
Admin Console.
Added cas(), the compare-and-set function, to the Memcache API.
http://code.google.com/p/googleappengine/issues/detail?id=2139
Added a set_default_fetch_deadline to the URLFetch API which sets the
URLFetch deadline globally.
Added app_identity api with methods to get the application id, default
hostname, and service accounts for asserting identity on outbound HTTP
calls.
http://code.google.com/appengine/docs/python/appidentity/overview.html
Added an improved HRD migration tool that requires a read-only period
relative to your datastore write rate (as opposed to your datastore
size, which is how the current version behaves). The tool is not yet
generally available. If you are interested in being an early adopter
please fill out this form:
http://goo.gl/3jrXu
Fixed an issue in the Channel API where jsapi was not served with the
correct mime type.
Fixed an issue that broke use_library when the Python SDK was located
in a directory that contained the word 'django'.
Fixed an issue where blobs could not be uploaded using HTTPS.
Fixed an issue where GQL didn't allow querying for valid kind names
containing '.', '-', and ':' by supporting quoted identifiers.
http://code.google.com/p/googleappengine/issues/detail?id=2584

Java
====

We've removed the limit on the size of blob uploads using the Blobstore API.
You can now send emails with any attachment extension that is not
included on the email attachment extension blacklist.
Added a getIndexes() method to the DatastoreService? to retrieve an
application's indexes and their corresponding states.
The development server has been updated to understand the reduced
index requirements of the 1.5.2 datastore query planner changes.
The Datastore Admin functionality can now be enabled directly in the
Admin Console.
You can now use Remote API to access the services of one App Engine
application from a different App Engine application.
The Java Testing APIs now default to UTC if no timezone is specified.
AppCfg? now supports download_app, which will download all files that
were uploaded from your war directory.
AppCfg? now supports the -V (version) and -A (application) flags.
Added app_identity api with methods to work with service accounts for
asserting identity on outbound HTTP calls.
http://code.google.com/appengine/docs/java/appidentity/overview.html
Added an improved HRD migration tool that requires a read-only period
relative to your datastore write rate (as opposed to your datastore
size, which is how the current version behaves). The tool is not yet
generally available. If you are interested in being an early adopter
please fill out this form:
http://goo.gl/3jrXu
Fixed an issue in the Channel API where jsapi was not served with the
correct mime type.
Fixed an issue where blobs could not be uploaded using HTTPS.
Fixed an issue where GQL didn't allow querying for valid kind names
containing '.', '-', and ':' by supporting quoted identifiers.
http://code.google.com/p/googleappengine/issues/detail?id=2584

Go
===

appengine:
  - Add app identity functions: AppID, VersionID, DefaultVersionHostname.
appengine/datastore:
  - Fix construction of incomplete keys with parents.
appengine/delay:
  - Check argument types at Call time.
  - Retry delayed functions if they return a non-nil os.Error.
Other:
  - Report package dependency cycles in go-app-builder.
-- 
Johan Euphrosine (proppy)
Developer Programs Engineer
Google Developer Relations

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