I have a feeling that this arc will end with face activating, but Lumen Histoire will do something which will prolong seal breaking. That way, Acnologia and Igneel will break their fight, since I don't see Mashima killing of Igneel right after he is out. Or at least I hope he wont kill him. I wish that he doesn't kill him. Hell, I will pay Mashima if he doesn't just kill him off. This is our first clue on what happened to dragons, and if he decides that "Death is silent", that will be such a cheap way out.