SummerSlam is 75% booked, according to what WWE sources have told David Bixenspan at the Figure Four newsletter. The creative team is working backwards to Battleground so just about everything important has been locked well in advanced.
One more note on Summerslam. The latest issue of WWE Kids magazine features Roman Reigns and Triple H on the cover and reads: Roman Reigns vs. Triple H. Who will come out on top?” That would seem to hint that the match would be taking place next month at SummerSlam instead of at the September pay-per-view.