Firefox 4 beta 13 pre available on Nightly..

The official Firefox 4 beta offering is still at beta 11, but head on over to the nightly build.. and it's showing as beta 13 pre - so does this mean beta 12 is done, and will be available soon?

Nightly Build Updating to Firefox 4 Beta 13 pre..

Yes and No.. Remember, there is no fixed schedule for the release of Beta 12..
In an statement on the Google group Mozilla.Dev.Planning, Christian Legnitto, Firefox Release Manager, says beta 13 is a versioning bug..

There is NO beta 13.. got it?