Mozilla has completed the merge of Firefox 11 to the Aurora developmental channel on December 23rd, 2011. From Mozilla Future Releases:

The new Firefox Aurora for Android update includes a new native Android interface that we need your help testing. Users will experience a faster start-up time, new design, improved start page and more.  This Firefox Aurora update also includes Flash support. Look for further Firefox Aurora updates soon that will add features like Firefox Sync, additional add-ons support and more.

Current Aurora users can update to the new version via Aurora Button > Help > About Aurora. New Aurora users can download and install via the Mozilla Future of Firefox site. Firefox 11 is scheduled for release on March 13, 2012.