Brock Lesnar's Hell In A Cell Opponent

If Lesnar does in fact retain his WWE World Heavyweight Championship beating Cena yet again at Night of Champions tonight then if Lesnar does work Hell in a Cell then I wonder who would Lesnar face inside the Hell in a Cell structure? Plus Lesnar has experience inside Hell in a Cell because who did he beat inside Hell in a Cell when he was still a relative rookie? He beat the man whose streak he ended at WrestleMania 30, beat The Undertaker inside Hell in a Cell back in 2003 to retain the WWE Championship, so if Lesnar 11 years later has to compete inside Satan's structure inside the Devil's playground I can only imagine who he ends up facing inside Hell in a Cell