Psycho prequel in the works from A&E.
Okay, that's not strictly supernatural, but I'm stretching the rules to let it in here.
A&E said today that it is in early development on Bates Motel, a drama series that serves as a prequel to Alfred Hitchcock’s horror classic Psycho. Bates Motel, from Universal TV and writer Anthony Cipriano, will delve into how Norman Bates’ dark, twisted backstory from childhood through his teen years and will chronicle how his mother, Norma, and her lover damaged Norman, helping shape the most well-known serial killing motel owner in history.
As a proportion of TV development overall, sf/f is more dominant so far this year than I've ever seen. I've seen a smattering of non-genre shows in development (Starz' Marco Polo