If the Docs Project is able to complete a transition to Publican for
the release notes for Fedora 10, many of our language codes will
change to ISO standards. This includes moving from en_US to en-US, as
in "Release_Notes-en-US.txt".
It would probably be good if any tools used to spin or release the
distribution get updated to support both of these options. I would
suggest shifting them to use the ISO standard, en-US, first and the
try falling back to en_US. That way, if we fail utterly and have to
drop back to the old way of doing business, the results will still
land properly.