That revision number should be good for testing islands. That's both BT and Dwilight.
Stable islands are indeed farther behind. I don't think there's any easy way to determine the rev level of a stable island. All code revisions have a rev number, including new features. So if a new feature is not moved to stable islands (like the the flagged messages), but a later bug fix *is* put on stable, then stable will be "missing" some revisions.
