A DX vs. Rated RKO match is not scheduled to take place at SummerSlam. The reason for this is that Vince McMahon doesn’t know what he can with the team to keep them hot until SummerSlam. As things stand now, an Edge vs. Randy Orton feud is scheduled to take place well before SummerSlam. No word yet on who will be the babyface and who will be the heel in the program.
On the otherhand, when Triple H comes back, which should be at SummerSlam, he wants to have a natural feud. Which is why he wants to continue his feud with Rated RKO. However, Edge is politicking to not work against Triple H when he recovers.