As noted in https://incenp.org/notes/2015/keys-in-dns.html, both the "pka" and "dane" PGP key publication techniques will probably (eventually) be replaced with the new OPENPGPKEY DNS record type. Once they finalize that standard (currently https://tools.ietf.org/html/draft-ietf-dane-openpgpkey-12) and the GnuPG or other folks actually implement support for that, it would probably be worth documenting as well.
As noted in https://incenp.org/notes/2015/keys-in-dns.html, both the "pka" and "dane" PGP key publication techniques will probably (eventually) be replaced with the new OPENPGPKEY DNS record type. Once they finalize that standard (currently https://tools.ietf.org/html/draft-ietf-dane-openpgpkey-12) and the GnuPG or other folks actually implement support for that, it would probably be worth documenting as well.