First, Android Studio is created and maintained by Google toolkit development team. That means that seemingly every latest update of Android Development will be pushed to AS at the first time. Second, AS is an integration of different Android Development Tools, including ADT, IntelliJ, Gradle, Maven, Ant...You know, ADT could be pluggin in many different open-source development tools, like Eclipse, IntelliJ, NetBeans...When you migrate projects from one to another, some problems could be caused because they have different programming rules and formats which pains not only developers but also Google's and Android's. That is a question. So Android Studio may be a solution for this.
