The guy on the LHR Facebook page who announced that Eastern were launching MME-LHR with an E170 (he did jump the gun a few weeks earlier as well) has just updated his post. He says that they will also be running an E190 on the route and that after the launch in September, it will increase to 3 daily.
Let's see if this happens but if Eastern have managed to nab those FlyBe remedy slots from BA, then I guess this would mean the end of MME-LCY?