We are announcing start of Play 2.0 support. Alpha version of new Play 2.0 plugin for IntelliJ IDEA just released: http://plugins.intellij.net/plugin/index?pr=&pluginId=7080
It comes with basic template language support, which includes go to declaration, completion and some features inherited from Scala and Html editors.
We are planning to implement other cool features like formatter, project wizard, refactorings and etc. Please feel free to report any problems and new features suggestions to our Scala plugin bugtracker (Play 2.0 plugin is part of Scala plugin infrastructure): http://youtrack.jetbrains.com/issues/SCL