Hi Bill,
We haven't finalized a plan for moving to IntelliJ 9. From my reading of the licensing information, JetBrains will continue to offer the free license for open source projects with the Ultimate Edition:
http://www.jetbrains.com/idea/buy/index.jsp
We plan to continue renewing this license. The current open source license should work with the new version.
Since LabKey is a company that is paid to do development on the open source LabKey Server code, we can't use the free license ourselves and have purchased commercial licenses. Determining when we want to buy upgrades for our licenses is the main issue for when we'll migrate to 9.0.
Thanks,
Josh