Mozilla has completed the merge of Firefox 12 on to the Aurora developmental channel on February 3, 2012.
What’s New in Firefox Aurora:
- Firefox Aurora Notes for Windows, Mac, Linux
- For Developers: Firefox Aurora Hacks
Firefox 12 is scheduled for release on April 24, 2012. You can test out Firefox 12 Aurora from here. Existing Aurora users should be able to update from within Aurora via Help > About Aurora.