#1 The Fiend could make an appearance

Tonight's show will be huge for a lot of reasons, and one of those could be due to an appearance from The Fiend. Since returning to WWE at SummerSlam, Bray Wyatt's new darker side has decimated everyone in its path, as well as earning itself a legion of loyal fans.
Though Wyatt has only competed in one match on TV (as well as a two on one handicap dark match victory over the B-Team), there are reports suggesting that he could face the Universal Champion for a title match at Hell in a Cell. Currently, the champion is Seth Rollins, who will take on his RAW Tag Team Title partner Braun Strowman in one of two matches their pair will have tonight.
Female superstar says she inspired John Cena turning heel HERE
With Wyatt's eyes on the Universal title, it's highly likely that The Fiend could make his presence known during tonight's Universal title match between the Architect and the Monster Among Men, especially with reports he will be at the arena. It's been years since the Eater of Worlds last held a World Championship in WWE, though that could all change in a matter of weeks at Hell in a Cell.