The CW has released an official description of the Season 7 Finale episode
7.23 – “Survival of the Fittest“. Airs: Friday, May 18th, 2012 at 9/8c

SAM AND DEAN STORM SUCROCORP TO TAKE DOWN DICK ROMAN — Dean (Jensen Ackles) and Sam (Jared Padalecki) prepare for battle with Dick Roman (James Patrick Stuart). Dick’s in the final phase of his plan and the Winchesters must team up with Castiel (Misha Collins), Bobby (Jim Beaver), Meg (Rachel Miner) and Kevin (Osric Chau), the prophet, to stop him. However, Dick is one of the smartest enemies they’ve ever faced so it’s a mind game to see who can keep the upper hand.

Written by: Sera Gamble, Directed by: Robert Singer

Source: The CW