We are planning for a Firefox 2.0 and 3.0, but will divide the planned work over (at this point) three major Milestones, 1.5 (September 2005), 2.0 (unscheduled) and 3.0 (unscheduled). All major development work will be done on the Mozilla trunk, and these releases will coincide with Gecko version revs. -1.1a1 Deer Park Alpha 1 released 2005-05-31 Non-Feature Complete developer preview release -1.1a2 Deer Park Alpha 2 released 2005-07-12 Bugs Non-Feature Complete developer preview release -1.4 Firefox 1.5 Beta release August 2005 Feature Complete general preview release -1.5 Firefox 1.5 release in 2005 New Gecko, ongoing HIG compliance, sw/update and extension manager improvements. -2.0 "The Ocho" Q1 2006 -3.0 Q3 2006 Firefox 1.5 etc will be referred to as "Mozilla Firefox". Firefox 2.0 will be called "Mozilla Firefox 2". Detailed version information will be displayed in the About box. Source: Firefox roadmap
I think i have the most up to date Mozilla client although I cant say ive noticed much difference inbetween them all but this can only be good news