The Firefox 2.0 roadmap was recently released, and it looks like they'll stand on the solid 1.0 release for a while. The planned 1.1 release won't be until March of next year, with 1.5 and 2.0 to follow sometime after. I think this is a good thing. 1.0 has been pretty rock solid for me. Aside from bug fixes, there is nothing too major yet on tap for the next versions.
http://www.mozilla.org/projects/firefox/roadmap.html