Dark Heresy is a little old. Ascension takes all of Dark Heresy's flaws and makes them glaring (SKILLS EVERYWHERE, unstoppable psykers, class balance goes right out the window, plus that whole Temple Assassin snafu).
I think Ascension is a fantastic idea. I think that Dark Heresy isn't the proper form for it! Would it work as an Only War hack (new Specs with better gear and more xp) and would anyone want to see it?