If those rumours are true, and Faith will run like that....then even with the 6+ invuln given, my sisters' survivability will be cut by at least 1/4. When I play, I stock as much Faith points and keep it around for clutch rounds where I need to give a unit or two as much help as they can get. Limiting a unit to a single act of faith would work if you could use it once per round for free, but needing to roll a 5+ on an arbitrary amount of dice? That's just ludicrous. So i get less options and a lower chance of succeeding in rolls unless I toss all my dice at a single roll. Cool.
I'll just have to hope that this rumour is false, because it would work well towards crippling my army.
If Priests are still as bad as before, and Repentia slightly improve and the Arco-flags are as terrible as they are in the GK codex, the Priest could very well be top 3 worst units in 40k, with the Arcos potentially top 8.
So long as Priests aren't required to field units though, I'm fine with it. I'd just be confused as to why they'd include them, they're pretty useless and unless they're re-tooled(or their point cost is cut to 20 or so), they'll continue to be.
Maybe without Inquisition, the Arcos won't even be in my army(nor will my nicely painted Karamazov), to which I'd wonder how the hell will I have a feasible assault squad? Maybe Seraphim will get buffed or something? I don't see Repentia getting good enough to be realistic. No Assault Inquisitors(not that they were good to begin with).
Will be interesting for sure though. I just kind of hope these rumours aren't true for the most part.