Ask HN: What is then different between Android Studio and IntelliJ IDEA?

none. Even so, Idea just write an post, telling the world about the new version. Witch of course, has all the glamorous stuff that Android Studio has. As you see, Android Studio is at 0.1 version, intellij 13 EAP is the same. Idea has the due date for late December for official release

AS includes additional plugin(s)?

Google's official backing?