New spoilers from Michael Ausiello

Question: It seems like it’s been forever since there was some big Supernatural scoop? — Jeff
Ausiello: Oh, really? Well, have you heard that Cass is getting a sidekick? Because he is. Rachel — as yet uncast — will be a pretty twentysomething angel with a finely tuned BS detector. Also, when Sam and Dean visit the Old West later this season, they’ll meet, ironically, an Easterner: Samuel Colt, a middle-aged hunter who’s tarnished his own legend by becoming more interested in pouring his next drink than firing his next shot. You reckon he’ll be able to help them dispatch Elias Finch, the innocent specter out for vengeance after being hung?

Source:  TVLine