In regards to the two movies, John Campea confirming that two sources close to production are saying it “will probably [happen]” and are “something they are seriously sitting down and looking at” is a good sign; to me, it means they are very confident in what they’ve made.
I don’t know where the allegation-plot change rumors fall in this, if at all. Having the allegations in a completely separate film (Part Two) would probably appease investors…
EDIT: Another interesting quote:
“I have heard [from my sources] that they are very, very proud of this film. I've heard they're very proud of the movie, that it's a great movie. What I was told was there are times when it's a hard watch, but they meant that in the really good way. I mean, just think of some other films, some of the greatest films ever had those moments that are really hard to watch. I've heard that, but also they're extremely proud of this film. And I just don't see this as being anything but a win for them if they [release two films].”