Last night on Raw, Becky Lynch showed up to challenge Ronda Rousey for her Women's Championship at WrestleMania, and while we didn't actually hear it from Seth Rollins himself (he was too busy getting F5d into oblivion), it was assumed that he would be facing Brock Lesnar for the Universal Championship.
Shortly after the show ended, WWE made both matches official via the 'Mania Twitter account - but we still don't know which match will be the main event.
No women's bout in the the company's history has ever headlined WrestleMania, and The Man vs. The Baddest Woman on the Planet is one of the biggest matches - male or female - to come along in a very long time.
So, it would obviously be a major missed opportunity if that didn't close out the show, but we'll have to wait and see what the powers that be decide to do.