Exorcised PCs...I'm interested in seeing what they do with this as I don't think there's a precedent for that in the established canon? Daemonic possession is usually a terminal fate, one way or the other.
Well...the exorcised elite advance in DH1?
What kind of thing would you want more of, after these 3?
Well, like what has been said before:
-Bestiary
-Either a 2nd Edition of the other game lines, or something to make Astartes come in line with the system (playing deathwatch/greyknight); which would be nice for stand alone game or even full campaign of that type. Same for rogue traders.
-Stuff about worlds and background of Askellon Sector
-A general book for evils and conspiracies (Ala disciples of the dark gods)
-Other scenarii and such.