Our Mac build infrastructure has been having issues this week so we've been unable to cut a build. If we can't get a build out and have QA sign off by noon (US Pacific) on Monday we're going to push the release to early next year. It's a frustrating result for us as well, but with holidays approaching folks are going to be taking time off and we don't want to ship without having people around to respond to feedback. I've updated the wiki to note the delay.
As far as what you can do in the meantime, aside from some configuration changes (changing the version number, removing bits that identify it as a pre-release, etc) the RC is the same as the final build. If you're working well with r22 RC1 it should be a trivial change to update to r22 stable when it ships.