Dan should certainly be encouraged to resubmit his UDNS proposal, but in
the meantime, I would like to point out that draft-hall-dm-idns-00.txt is
the dual-mode draft that is currently in the WG pool. Perhaps your
confusion stems from the I-D-N.net web site, which still lists UDNS as an
active document, and which does not list DM-IDNS.
And for those that are looking at other IDNA to UTF-8 in DNS transitional
schemes it would be useful to look at the open issue regarding DNSSEC
that I pointed out about draft-hall-dm-idns-00.txt a while back.
I suspect that all such transitional schemes will have the same issue
when DNSSEC is used to provide integrity of the RRsets: can't depends
on servers synthesing records in general and can't have caching resolvers
modify the queries and/or responses.