WKD (Web Key Directory) is an
experimental feature
that allows users to authoratively publish their public PGP keys on the web, via HTTPS.
Unlike other solutions (like public keyservers), WKD has the advantage that the owner
of the domain has some degree of control over what keys are published and as such there
is more certainity that the key actually belongs to it's owner.
As of this version, there is no support for WKS - This may or may not change in the future.