ReadWriteWeb has the full details of what this release includes. There are at least as many goodies for web developers as for end users. This also marks a transition in Mozilla’s release cycles to more of rolling releases rather than big feature pushes. I hope that means we see some of the ambitious improvements that are planned, like multi-processor support, hit our computers that much sooner.
If you’ve got the automatic update enabled, you should be receiving the new version soon if you haven’t already. The impatient can still download it directly and update. If you’ve been running the betas and release candidates, like me, then you’ll already have some soon of the lovely improvements this version brings with it.