It’s live now for me as well… although pacman complains about the key being unknown:
error: mesa-nonfree: key "86412CE3A5C73C6CDD2F5B11B728DB23B92CB01B" is unknown
:: Import PGP key 86412CE3A5C73C6CDD2F5B11B728DB23B92CB01B? [Y/n]
error: key "86412CE3A5C73C6CDD2F5B11B728DB23B92CB01B" could not be imported
error: failed to synchronize all databases (unexpected error)
-> error refreshing databases - exit status 1
and pacman-key complains about invalid packet:
sudo pacman-key --recv-keys B728DB23B92CB01B && \
sudo pacman-key --lsign-key B728DB23B92CB01B
gpg: [don't know]: invalid packet (ctb=00)
gpg: keydb_get_keyblock failed: Value not found
gpg: [don't know]: invalid packet (ctb=00)
gpg: /etc/pacman.d/gnupg/pubring.gpg: copy to '/etc/pacman.d/gnupg/pubring.gpg.tmp' failed: Invalid packet
gpg: error writing keyring '/etc/pacman.d/gnupg/pubring.gpg': Invalid packet
gpg: error reading '[stream]': Invalid packet
gpg: Total number processed: 0
==> ERROR: Remote key not fetched correctly from keyserver.
(pasted for easier googling)
Turns out trying to update while nonfree.eu was down somehow broke my pubring.gpg but fortunately there was a backup available so all I had to do to fix this issue was:
cd /etc/pacman.d/gnupg
sudo cp pubring.gpg~ pubring.gpg