Procmail + mbx format

Does procmail yet natively support the mbx mail-file format?  If not, are there
plans to do that?

I understand that what's used in the past is to use dmail and then call procmail
out of the .forward file.  However, I prefer to use procmail as my mta.  In 
fact,
I'll gladly take the hit in imap performance in exchange for the use of 
procmail.

Just curious...