[IntelliJ IDEA 13 has been released][1]! My favorite new feature is the [sbt project support][2] that alleviates the need to generate project files for Play Framework apps. Here is a short screencast that will show you how to create a new Play app with Typesafe Activator and then open that project in IntelliJ IDEA 13:
<iframe width="640" height="360" src="//www.youtube.com/embed/I7_lm4B7uTU?rel=0" frameborder="0" allowfullscreen></iframe>

Pretty sweet stuff!

 [1]: http://blog.jetbrains.com/idea/2013/12/intellij-idea-13-is-released-work-miracles-in-java-and-beyond/
 [2]: http://blog.jetbrains.com/scala/2013/11/18/built-in-sbt-support-in-intellij-idea-13/