Since buying Pride in 2006 and having a monopoly on the market and nearly every fighter available under one roof, list the superfights that Dana claims the ufc makes. And dont bother with Liddell Wanderlai, it was too late.
The only bona fide superfight has been GSP vs Penn 2, which was a title fight between 2 active, proven, p4p-class champions. For me, that's the definition of 'superfight'.
But if you stretch the definition a little, you could also include:
Rampage vs Hendo (UFC champ vs Pride champ)
Anderson vs Hendo (same)
Jones vs Cormier (UFC champ vs Strikeforce GP champ)
Aldo vs Edgar (FW champ vs guy who clearly won LW title fight in previous fight but got robbed)
GSP vs Shields (UFC champ vs Strikeforce champ)
Hughes vs BJ 1 (UFC champ vs Rumble on Rock tournament winner)
Benson vs Melendez (UFC champ vs Strikeforce champ).
IMO, if an other-org champ loses a fight before fighting a UFC champ, it doesn't have the shine of a superfight.
Rousey vs Cyborg, Dillashaw vs Cruz and Cormier vs Jones 2 are the next 3 pseudo-superfights to be made.