Just to add more to the rumor fire, here are the songs that Dave helped write that they haven't performed yet:
Mechanix (although they did The Four Horsemen)
Jump In The Fire
Ride The Lightning
01/12 - Zero Boys?
01/16 - Origin w/ Trog
01/24 - Into It. Over It.
02/09 - Amon Amarth w/ Enslaved, Skeletonwitch