Yes - I used the latest IntelliJ v 13.1 build 133.818 with Scala + Play plugins and it loaded right up from Github no issues.
With the latest/greatest IntelliJ, it supports SBT projects natively, so gen-idea is no longer necessary. When you import a project from Github, you can tell it that its an SBT project and it will do the right thing to set it up.
Be patient as it does take a while to get everything sorted!
Good luck!
-t