see http://cgit.freedesktop.org/systemd/systemd-stable/?h=v210-stable
yes, it's being discussed over at gentoo-systemd@. the discussion is available on gmane or other mailing list readers.
+*systemd-208.9999 (02 Mar 2014) +*systemd-210.9999 (02 Mar 2014) + + 02 Mar 2014; Michał Górny <mgorny@gentoo.org> +systemd-208.9999.ebuild, + +systemd-210.9999.ebuild: + Add stable branch git ebuilds, bug #503172. Compile-tested and unsupported like other live ebuilds. We'll try to wrap up a new 208 version soon though.