Mozilla just came by to talk about Firefox 2.0 and casually mentioned they were making release candidate 2 available. You can download it now from Mozilla's site, or if you're already using last weeks's 2.0 release candidate 1 you should eventually get prompted to install the new version. I just manually ran a check for updates under the Help menu and got it.
Release candidates are for polishing and fixing before a final release, so RC2 should look almost exactly like RC1. Mozilla said there might be one more release candidate before the final 2.0 version, which should be out in the ‘next few weeks’.