The beta release provides access to the AIR 3.9 runtime and SDK for Windows, Mac OS, iOS and Android.

Below are some of the key features and benefits of AIR 3.9:

Mobile Workers (concurrency) for Android - BETA – Our hugely popular desktop feature, AIR Workers, is now making its debut on mobile! We have added support on Android devices so that you will be able to execute code in the background without interrupting your application’s main code. Your UI will remain responsive, enhancing the user experience. We haven’t forgotten about iOS! Look for news on iOS workers in an upcoming release (NOTE: this feature will undergo an extended beta period).

Mobile Support for Background Execution in “Direct” Render Mode – AIR now supports background execution of code on iOS and Android when render mode is set to “direct”.  This will allow your applications to perform tasks such as audio playback even when invisible to the user. Due to power and CPU considerations, we recommend reviewing our release notes for additional details and guidance.

New and Improved AOT for AIR iOS - BETA – With our new AOT compiler, we’re improving the build time for iOS applications dramatically. (NOTE: this feature will undergo an extended beta period).

Support for iOS7 – iOS7 is approaching and we are making sure that AIR is compatible and performs as expected.

Mac OS 10.9 Support – We have tested against the latest developer releases of OS X 10.9 and are making sure that your applications support the latest technologies such as “App Nap”.

XXHDPI Icon Support – With this feature we have added support for beautiful, high resolution icons on devices such as the Nexus 10.