Android Studio 2.0 and Emulator 25.1.1 are officially now

Android Studio 2.0 and Emulator 25.1.1 are moved to stable release channels.
This release is focused on development productivity by introducing instant run and a much faster emulator. Please see our blog post for more details.

announcement: Android Tools Project Site - Android Studio 2.0 and Emulator 25.1.1 are Available in the Stable, Beta, and Dev Channels

Upgrade to Android Studio 2.0 from 1.5: