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This page all of the App Engine features and their availability.
Trusted Tester and Experimental features are not considered stable, they may be changed in backward incompatible ways, and may be deprecated at Google's discretion.
Roadmap features are actively under development by the App Engine Team. Most of these features here are intended to be launched within the following six months:
Trusted tester features are limited to a closed group of testers and require you to sign up in advance in order to use the feature.
Experimental Features are available to everyone but are new and often rapidly changing features. They are not yet considered stable and so should not be used if reliability is important. They might change (including backwards-incompatible changes). Experimental features typically become full Production features but sometimes are removed completely.
The following features and APIs are generally available and considered stable.