Supernatural: Bloodlines

At Comic Con 2013 Executive Producer bob Singer announced that a spin-off saeries for Supernatural was being planned. It would begin as an "embedded pilot" with new characters introduced in Episode 20 of Season 9, to be written by Andrew Dabb. Source.

Singer explained that:

"It’s an entirely different cast of characters. And unlike Supernatural – which is a road show — this will take place in one place (Chicago) with a wider cast of characters. (It will) explore the clashing monster and human characters living in the city...We’ll have main characters who are both human and monsters. That will include, families of monsters and families of hunters. It’s much more of an ensemble than Supernatural. Source