That's strange sendmial.org says the following:

 Welcome to sendmail.org
This web site is maintained by the Sendmail Consortium to be a resource
for the freeware version of sendmailTM. Sponsored by Sendmail, Inc.
    *
      Recent News
          o Sendmail 8.13.2 is available (2004-12-15).


Never herd of sendmail 9 or X.

          
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] 
Sent: Monday, January 10, 2005 2:04 PM
To: [log in to unmask]
Subject: Re: Sendmail, mail it all in lower case, how?

"LISTSERV site administrators' forum" <[log in to unmask]>
wrote on 01/10/2005 12:17:51 PM:

> Umm.. Sendmail *9*?? Latest I've seen officially is 8.13.3.Beta0. ;)
> 
> (and if you have something later than that unofficially, you already
> *know* who you should be asking that question.  And here I'm speaking 
> as somebody who unofficially knows the answer to that one..;)

Gee, it doesn't seem to be a secret that they are working on a new
version.  The sendmail.org site has this to say: "The next generation of
sendmail is called sendmail X (previously it was called sendmail 9)."