Last week, Google announced the last update for Google App Engine in 2012. GAE 1.7.4 provides expanded EU support, as well as a new Maven plugin for Java devs. There are also a few experimental steps to be read about in the GAE Python release notes.
From the official Google Developer Blog:
We've made a new Maven plugin available, added the source to the SDK for easier IDE debugging, and made significant performance improvements to the JSP compilation process. Please see our Java release notes for more information.
We’ve made a big push to bring a number of new features to GA, upgraded the interpreter to version 2.7.3, and added several new experimental features. For more details, please see our Python release notes.