Yes...Morrison's long awaited and delayed Multiversity. I'm starting to lose hope that we'll ever see it. I think it's been three years now since it was first announced? Was supposed to come out last summer but then Flashpoint and the relaunch happened so it was probably put on the back burner.
Last time I read about it, it was coming out this summer, which of course isn't happening either. But I don't think it's been completely shelved, DC probably wanted to wait some time to establish its new prime universe, before showcasing any others.