Go get it!
Mozilla has, IMHO unadvisedly, decided to do some late-breaking significant interface changes. These changes are only partially in beta 11; the most noticeable is the status notation at the lower left during network exchanges a la Chrome. This is fine, no worries, and even welcome. However, Mozilla is planning to redo the location bar and remove the hovered URL, restoring it to its former location or something approximating that, and all that just as I'd gotten used to it in its current place. I suspect this will confuse users all over again who, like me, had become accustomed to the current layout; adding insult to injury, for whatever reason this does not seem to have made the cutoff for b11, and that's not a good thing either because the inevitable screaming about this needs to be dealt with early and not reserved for beta 12 (or 13). Nevertheless, expect some alteration in the next beta.
Mozilla is getting better about their time-based delivery and their estimates are becoming more accurate as the formal release nears shipping (I estimate mid-March). The big question is if there will be a beta 13. If there will not be, then we will release beta 12 and go formal. If there will be a beta 13, we will skip 12, release 13, and go formal. Heaven help us if there's a 14.
For builders, changesets will be up later tonight or tomorrow morning.