From systemd-223 on, there'll be no more builtin Python support in sys-apps/systemd which also means it needs to be dropped from the current -9999 ebuild. Python support is now a separate package. See URL for more details.
Please check the current state of the tree before filing a bug. Thanks. *systemd-222 (09 Jul 2015) 09 Jul 2015; Mike Gilbert <floppym@gentoo.org> +systemd-222.ebuild, systemd-9999.ebuild: Version bump. Move python modules to dev-python/python-systemd.