First mobile with a computation platform. Able to run Renderscript computation directly in the GPU on the Nexus 10.
With new interactive lock screen widgets, wherein you can instantly access any aplication with a small updates. you can adapt any application widget to apply in the lock screen.
New interaction and entertainment experiencesAndroid 4.2 introduces platform support for external displays that goes beyond mirroring. Your apps can now target unique and valuable content to any number of displays attached to an Android device.
Enhancements for international usersTo help you create better apps for users in languages such as Arabic, Hebrew, and Persian, Android 4.2 includes native RTL support, including layout mirroring. With native RTL support, you can deliver the same great app experience to all of your users with minimal extra work. Android 4.2 also includes a variety of font and character optimizations for Korean, Japanese, Indic, Thai, Arabic and Hebrew writing systems.
To get started, Download the SDK platform.