That sure looks like Maria in the next episode preview, though in a state that makes me more and more thinking she's been tortured/lobotomized/etc. I mean, if those rats had to use some of her real bones to fool Asahina, then I can only imagine what they did to Maria to keep her alive (and, in a state that doesn't have her exterminate the lot of them).
My only real complaint this episode (besides it not moving the story forward much), was that with all the power available to them via their Cantus, they really can't move a wounded woman?
Anyways, can't wait 'till next week.
edit: One day, animesuki will have two episode threads for anime with pre-existing material; one for those who derive pleasure in comparing an anime with the source, and one where the rest of us can avoid passive-aggressive spoilers.