The official release date for Firefox v2.0 is scheduled for tomorrow, but the browser is already available on the Open Source Lab download server. Based on the User Agent details given by the browser, the official v2.0 release uses the same engine as the v2.0 RC3 (Gecko/20061010 Firefox/2.0). It is possible, although unlikely, that the installation packages could be updated before the official release. No change log has been provided for the v2.0 yet. It is possible that no changes at all have been made since RC3. In any case you can download the now released final version of Firefox v2.0 from http://Filepedia.com.
Firefox 2.0 is available at:
http://www.filepedia.com/network_software/web_browsers/firefox.cfm