As @NJPLP stated in other post,
on the "Art of Meteora" appears lyrics from unknown Meteora demos we probably don't know about that was scribbled on the Meteora art wall by Chester.
1) "Somebody angry (with the word ‘angry’ crossed out) broken." - More The Victim
2) "I've carried this weight for too long... Disassociated, unappreciated. And everything I've hated, keeping me so jaded. I look into the mirror, and I hate what I see. All my lifes disfunction, alive in front of me." - Unknown
3) "Wait ‘til I’m free, I promise you’ll see." - Unknown
4) "And everything I thought it'd be is nothing like it is." - Unknown
Maybe these last 3 lyrics are from the new demos: A6, Resolution, Healing Foot (?).. I think Wesside and Massive don't have vocals.
Rob said, "We had so many songs. We actually went into the studio with 18 songs that we recorded drums on." And according to a studio report from Mike, in total, the band worked on 15 full songs for the album, with 12 of them making the final cut. "Fighting Myself" and "A6" weren't in the final batch. "Lost", "More The Victim" and "Resolution" were in the final batch of 15 songs.
So, I think the next unreleased songs with full vocals are "Resolution" , "A6" and maybe "Healing Foot".