'Vanderpump Rules' is promising a bombshell revelation during its reunion finale. Here are 5 theories on what could happen.

Tom Sandoval (far left) and Raquel Leviss (right), discussed their affair at the "Vanderpump Rules" reunion.

Nicole Weingart/Bravo

• The final part of "Vanderpump Rules" three-part reunion airs Wednesday night.
• Producers have been promising a bombshell revelation but have been scant on details. 
• We've rounded up our top five theories as to what the possible revelation could be.

Season 10 of "Vanderpump Rules" has been the Season of the Witch, aka, Scandoval...