The Shield Reuniting at SummerSlam?

Not that all three ex-Shield members are on the same brand — Monday Night Raw — it looks like we’re finally going to have a proper reunion at some point.
On Monday’s Raw, Seth Rollins saved Dean Ambrose, and afterward, they made it a point to say that there’s not going to be a Shield reunion, which means one thing, there is going to be a Shield reunion. The only question is, when will it happen?
As of right now, it looks like Roman Reigns will be in the Universal Ch