JRun 4 Updater 7 is now officially live on Adobe.com and is publicly available to customers. Updater 7 now supports a host of new platforms, upgrades to existing software and bug fixes. Check the release notes for more details.
For those running multi-instance or standalone ColdFusion 8, there is no need to update using this updater. For users deploying on an EAR/WAR configuration on JRun, updater 7 is goodness.