TC interviews Matt about the player cards in Carn Dum here:
http://teamcovenant.com/blog/video/battle-of-carn-dum-unboxing-ft-matt-newman-lord-of-the-rings-lcg/
In the interview Matt drops a couple of hints about the coming spirit hero. He mentions that he or she will work well with the new Lindir and also that the "Elf twin deck is real and it's going to get more real." So once again I am hoping for Arwen and I'm wondering if the ability will be something like "Discard a card to place 1 resource on any hero in play. Limit 3 times per turn."