Michael Catanzaro commented:
Hm, it would not qualify for GNOME group under the new policy because it is not core. If #333 takes effect as proposed, then all the evolution repos except evolution-data-server (which is core) would move elsewhere. I've heard talk of grandfathering in existing repos, though.
Conclusion: ?????. It's not so clear what to do in this case. But from release team perspective, it's not core.