SpoilerTV - TV Spoilers

Supernatural - Episode 6.17 - Gallows Pole - Snippets

We can reveal the following.

Episode 6.17 will be called "Gallows Pole"
It will be set in 1861
There will be a female angel called Rachel who is loyal to Cass and the cause
It also features a man wrongfully executed by hanging called Elias

We also have the following from the San Francisco Convention

Thanks to Justin for the following

Jensen Ackles confirmed that in the Western Episode they are traveling back to find Samuel Colt