I don't know if anyone has seen this, but if your a big fan of Supernatural and animes such as Vampire D and Death Note; Madhouse, the producers of these animes is working on something to do with Supernatural.
There is more info here
tv.ign.com/articles/109/109614…I'm sure this will be a bad ass anime...maybe, I mean its the Winchester brothers how could it not be bad ass.