The dev team over at mozilla.org have quietly released RC2 to the FTP.
There is no announcement or changelog yet but sharp-eyed hajj_3 posted the location to grab the file on our Back Page News section of the forums.
Firefox 2 will be based on continued development of the Gecko 1.8 branch created for Firefox 1.5. The goal is that Firefox 1.5 and 2 are compatible from a web developer"s point of view. The final build of 2.0 is expected to be released Q3 this year.
Lee® contributed to this report