That was one of a dozen teases of events and storylines, all set for summer 2015, and are likely some sort of tie-in for the new multiversal Secret Wars rather than actual events in themselves. I mean, the list includes Civil War, Age of Ultron vs Marvel Zombies, Planet Hulk, Years of Future Past, Old Man Logan, Armor Wars, House of M, Age of Apocolypse, Atillian Rising, Future Imperfect, Infinity Gauntlet, and Ultimate The End. The Future Imperfect tease came out today, so there could easily be more of these on the way.