WWE appears not to really know if John Cena will be able to go at SummerSlam against Seth Rollins in their title for title, winner takes all match.
Dave Meltzer noted on the Wrestling Observer Radio last night that WWE has backup plans in case Cena cannot go at the pay-per-view event. Thus the reason Randy Orton was booked to face Seth Rollins in the main event of RAW.
As of now, Cena’s status at SummerSlam is fifty-fifty. Although he’s currently lifting weights so it appears he thinks he’ll be wrestling at that show.
The idea is that if Cena cannot go then they could book Orton vs. Rollins in a singles match or Orton vs. Rollins vs. Sheamus in a three-way at SummerSlam.
If Cena can go then they will resort back to their original plans of booking Sheamus vs. Orton and Rollins vs. Cena at SummerSlam.
The August 17th edition of RAW is where that decision will be made at because Cena’s condition will be better known at that time.