We had a very fun time testing it out and I encourage you to do the same. You not only can use UI for Android in Android Studio 2.0 as before, but the property changes you apply to the UI for Android components will be instantly reflected on the already deployed app using the Instant Run feature. I am happy to inform you that UI for Android works flawlessly in Android Studio 2.0 Beta. So, taking just these features into consideration, we were very interested to try out the new Android Studio 2.0 Beta and see how our UI for Android suite behaves there. That’s super cool as it will save you quite a lot of time in building and deploying your apps as you develop them. The Instant Run is particularly interesting as it allows an instant refresh of the deployed application as you apply changes to the code of that application.

The pile of improvements includes faster emulators, much faster builds (about 2-2.5 times faster) as well as Instant Run. A few weeks ago Google released Android Studio 2.0 Beta, and it's full of great improvements for Android developers.

Android studio beta 2.0