The key new features introduced in IntelliJ IDEA 11 include:

* Support for web development with the Play framework.

* Groovy 2.0 support with new intention actions and refactorings.

* Gradle integration.

* CoffeeScript editor with code assistance, inspections and formatting options.

* Grails 2.0 support with all its features, including also Grails web-flow and Spock framework.

And most importantly,

* The updated IntelliJ IDEA Community Edition gets important improvements for Android development, including live preview of Android UI layouts and compatibility with the latest Android 4.0 SDK (Ice Cream Sandwich).