Unless I missunderstood Pyro's dev update, it sounded like ME was going to be changed to allow CM's to setup missions for special events. I suspect that it will remain in a beta state until those changes are made. Pyro also mentioned wanting to bring back the old 8 player H2H. If this is the case people hosting the h2h arena might be allowed to host missions as well. I guess we'll have to wait and see, hopfully within the next year they'll have something..