The development release 5.21/02 is now available.
see root.cern.ch
Rene
The 5.21 release notes links points to:
v522/Version522.news.html
The link on this page to the downloads is to:
root.cern.ch/root/Version520.html
So it averages to version 21, but probably not what you wanted. 
Cheers,
Charles
Thanks Charles for this report. One of the inconsistencies is now fixed.
Rene