I don't think this is going to end any earlier, at the rate of each chapter per month, its gonna take a waaayyy long time before the story actually finishes. Hoshino has yet to elaborate on the story's characters!
-Allen (more about his past)
-Lavi (especially the thing about his eye)
-Lenalee (about her past struggles)
-The 14th (is he really good or bad?)
-The other new Noahs (Wisely...)
-Claud Nine (the scar on her face)
-Leverrier (Yeah he's an asshole but I suppose Hoshino would want to justify him a little)
Probably after this we'll learn more about how the 2nd exorcist & 3rd ones are really made.
What I don't really understand is, Kanda was killed by an akuma, and they took his brains and put it in another body. Alma too. So why do they act like kids when they're supposedly grownups? And where did they get the body from? :/
Hoshino has yet to say what happened to the 3rd exorcists after the dark matter swallowed them. I wonder what hapened? :O