There's a new, separate repo for Nomen specifications, and it's modeled after NIPs. They're called NOMs. I have opened a PR for a new NOM that allows indexers to publish their name data to relays, so that clients don't need to make external (or potentially proprietary) API calls to query names.
I would love feedback if any of you have interest in Nomen development: https://github.com/ursuscamp/noms/pull/1