Mozilla is planning on releasing Firefox 3.6 BETA this weekend or coming week.
One of the expected features to be released with the new version is the Personas add-on, which allows users to customize the look and feel of the browser to their tastes. Although this is an entirely cosmetic, it is very popular with users. Tabs will also get an update--new tabs created from clicking on a link will open to the immediate right of their parent page rather than opening far right on the tab strip. Firefox 3.6 will also support Open Web Font.