The big question for me skimming through the documents is whether any revisions would involve changes to the existing IDN structure, which could potentially stuff up us existing registrants if there were major rule changes. I think the answer, if I read correctly, is no:
"IDNA does not depend on any changes to DNS servers,
resolvers, or protocol elements, because the ASCII name service
provided by the existing DNS is entirely sufficient for IDNA.
IDNA is applied only to DNS labels."
[sigh of relief]
DT