Once again Mozilla has renumbered a future release in mid-build. They did this last year with Firefox 3.1 which became 3.5 with Beta 4 release in April. Firefox 3.7 has been renumbered as Firefox 4 with the upcoming Beta 1 release possibly as early as June 2010. Release Candidate 1 could be released as early as October 2010 which means we could see Firefox 4 released around Thanksgiving/Christmas.
Whilst on the subject of Firefox 3.7/4.0, there is currently not a code name assigned to this build. They have been labeled as Mozilla Developer Preview.
