Ok so I just put the big guy down and was eager to start my second play-through using the Seriphine character skin. Problem is that it's not available to me in any way, I used the key and received the email saying I had claimed everything but she's just not there. Did I somehow screw myself over by skipping the credits? Which wouldn't really make sense as I'm on the second play through with the upgraded weapons. Just wondering and thanks for any help.

To my knowledge the Assassin pack only came with a wal mart pre order.. I dont know how steam works or anything, but maybe that's why you didnt get it..
6-3-11 1213am

you have to enable it in the extra's menu (above where you claim the key)