#3 Gallows and Anderson/The Revival winning tag team gold

WWE Creative has been criticized often due to their poor booking of superstars and why not? Both Gallows/Anderson and the Revival have done nothing of note in 2017 other than put over other tag teams in their respective rosters. But with a supposed change in WWE management and chances being provided for one and all, both tag teams have a great chance of tasting their first success on the main roster.
There is the possibility of AJ Styles reuniting with his pals, Anderson and Gallows and holding championships all at the same time but nothing is as exciting as the AOP feuding with the Revival once again, reliving some of their classics in NXT. Nonetheless, both of the tag teams have a solid chance at gold with the need of fresh faces holding championships being what the fans desire.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
#2 Bayley and Sasha Banks: First Ever Women's Tag Team Champions

Bayley and Sasha Banks have had a tough 2018. Both of them are former RAW Women's Champions but have been overshadowed by the rise of Ronda Rousey. Their on-off relationship on screen has been subject to a lot of confusion with the fans wanting either of them to turn heel and go on an epic feud along the lines of Tomasso Ciampa and Johnny Gargano. But, all of that was put to waste when Mr McMahon announced that the introduction of the WWE Women's Tag Team Championship in 2019.
On taking a deeper look at the possible candidates such as Mandy Rose/Sonya Deville, The IIconics and Riott Squad, Sasha Banks and Bayley look the obvious champions with the prior build between the two and even a promo where the duo wanted the Women's Tag Team Championship to be introduced. This is the most obvious of all the events that are bound to speculation in the WWE as of now.