"I can 100% confirm that the 2015 edition of SummerSlam will be moving away from the Los Angeles area. Instead the event will take place in the NY / NJ area. I am working on where the exact location will be. I have a strong feeling it is going to be taking place in Red Bull Arena in New Jersey. But I can't confirm that for sure. The only thing I can confirm is that it will indeed be moving out of L.A. and in the NY / NJ area."
From metsfan4ever on reddit. He seems to be right about his stuff (except for AJ being pregnant).
Would be awesome for it to be at Red Bull Arena, although the traffic would be atrocious. It's small enough to be an arena (seats about 25K at full capacity) but the open air aspect would be pretty cool. I'd be there for sure
EDIT: Announced during the PPV tonight! Woo!