This morning I check in on #fvwm and the first thing I notice is the following:

03/06|01:03:06 < Hun> theBlackDragon: aaaaaaaaaaah!
03/06|01:03:13 < Hun> e22 has been released!

So I run off to the Emacs homepage, but nothing to be found about a new release. Hmm.
So what can you do? Check usenet of course, and sure enough on gnu.emacs.devel (e-mail addresses removed for obvious reasons):

From: David Kastrup <*@*>
 Subject: Re: Cygwin binaries for Emacs-22.1 released!
 Newsgroups: gmane.emacs.devel
 To: Angelo Graziosi <*@*>
 Cc: emacs-devel@gnu.org
 Date: Sat, 02 Jun 2007 21:18:05 +0200

Angelo Graziosi <*@*> writes:

> Cygwin binaries for 22.1 release here:
 >
 >    http://www.webalice.it/angelo.graziosi/Emacs.html

I was going to mouth off about premature announcements and being
 careless about release numbers, but checking on the ftp server have
 found that the tarball for Emacs 22.1 has been uploaded.

Did I miss the announcement on this list?

--
 David Kastrup

And sure enough, there it was, on the GNU FTP server, all shiny and new: an Emacs 22.1 tarball, the changes from 21.x are a little bit too numerous to sum up here, I’d say just upgrade or read the ChangeLog.