Here's some scoop from EW's Michael Ausiello:
Question: Can you give us some Supernatural scoop? -- Deborah
Ausiello: I'll give you some scoop and save you a call to your TV repairman: The show is staging an entirely B&W episode this fall. "It's an homage to the horror films of the '30s," says series creator Eric Kripke. "The boys are up against Dracula, the Wolfman and the Mummy. It's the most fun episode we've done in a long time." More fun than the one where Dean confessed his love to Rory? Oh, wait, wrong show.