Either way, you still have to wait until tomorrow for the official release notes, but here are some of the highlights included in Mozilla's next Firefox release:
- Twitter integration (you can choose Twitter as one of the default search options)
- Improved HTML5 support, including HTML5 context menus
- Better Tab control
- Add-ons are no longer installed willy-nilly and require user permission (that's not always in the case in previous versions of Firefox, perhaps most noticeable when installing antivirus software)
There are a bunch of other changes and tweaks, most of which are minor in nature.