Can openssh fetch pubkeys via network, i.e. via LDAP?

Issue

• When a user tries to log in openssh should not only consult local files like ~/.ssh/authorized_keys but fetch the pubkey via network or from other sources.
• The patches at http://code.google.com/p/openssh-lpk/ facilitate fetching via LDAP, will this be included in openssh as delivered?
• Until RHEL6.3 I used an own script with AuthorizedKeysCommand together to fetch ssh user pubkeys from LDAP. Since RHEL6.3 it is possible to use AuthorizedKeysCommand /usr/bin/sss_ssh_authorizedkeys to fetch ssh keys, can this replace my old script?