Since he said the controversy of the Royal Rumble would be addressed and that controversy is directly linked to Daniel Bryan, it'll obviously have something to do with Bryan. I wouldn't put it past him to troll people with the Curtis Axel stuff at first just for the lolz before giving the real announcement, though.
Either Roman Reigns will face off with Daniel Bryan at Fast Lane to determine who will really face Brock Lesnar at Wrestlemania, or (the thought of this is delicious and luscious to my brain) he announces that Brock Lesnar will defend his WWE World Heavyweight Championship one last time before Wrestlemania against Daniel Bryan at Fast Lane. The justification for either option despite Bryan fairly losing the Royal Rumble match could be that Bryan was forced to forfeit his championship last year and never actually lost it in in-ring competition.
Of course, people aren't gonna suddenly start cheering Roman Reigns again just because they gave Bryan a title shot and had him lose, so should that title match actually happen at Fast Lane, maybe they'll be some sort of non-finish or something that grants Bryan another shot at Wrestlemania. Either way, unless they're fucking with us in some way (which would be a pretty stupid thing for them to do), the WM main event looks like it's gonna be either Lensar vs Bryan or Lesnar vs Bryan vs Reigns.