#2 Both the Superstars use each other's moves
WWE is hyping this match as 'The Battle of Spears' however, during the recent contract signing segment on SmackDown, a tweet was brought up which mentioned that Roman Reigns uses a padded surface to punch his fist on the ramp because he is a full-timer and has to do it regularly unlike Goldberg.
This segment would have received a massive pop had it been taking place in a jam-packed arena but looking at the positive reaction to the jibes, WWE may plan to make this match more special by having the two Superstars use each other's moves. Obviously, Spear is the common move but as there was also a reference to the Super ShowDown match between The Undertaker and Goldberg, Roman could pull out a Jackhammer, showing the champ how it is done.
On the other hand, Goldberg can anger Roman by punching his fist on the ground and teasing a Superman Punch. These improvisations would make this bout very special. Since this title match is an all-out war and not the traditional heel vs face rivalry, WWE has very limited options to spice up the match.