The original plans for Sting at SummerSlam was for him to team with Roman Reigns and Dean Ambrose against the reunited Wyatt Family trio of Bray Wyatt, Luke Harper and Erick Rowan. That’s not going to happen now because Rowan’s out of action for several months due to a torn biceps.
According to Wrestling Observer Radio, the six man tag is likely going to happen with somebody replacing Rowan.
There’s a lot of speculation about who the partner of the Wyatt Family will be with the obvious name being Bo Dallas just because he’s the real life brother of Bray. The problem with that is that WWE may not want to change Dallas because he’s got his own gimmick already. The other side of it is that his comedy heel gimmick isn’t really going to get him that far, so a change could be good for him.