And here's our companion post to the release post:
LOD and the Upcoming Firestorm Release: The What and Why « ...

there any difference to the release candidate?

Tillie: There were a couple of release candidates, so just check the top of the screen for the five-digit number at the end of the release string. If you're on 53634, then no, there's no difference, and you can stay on the one you have. If you're still using any lower number (like 53579), then you'll need to update. Older RCs will be blocked at some point.

Thanks !