The Forever Winter Scorchline Skin Pack includes: 

The Kilnwalker Skin for Gunhead

“The Sand eats the fallen. I add to the bones.”

The Emberdrift Skin for Scavgirl

“Nothing stays buried out here.”

The Dune Wraith Skin for Shaman

“You hear the wind. I hear the dead in it.”

New skins will be applied the first time you use the character after acquiring them. After that, skins are selected at random after every death or can be manually selected in your Innards. If you want the true FW experience, treat that skav as dead and let the revolver decide.