I guess not many ever read the book because...there's kind of a lot of changes...Jessica was suppose to give birth to her child already, and Paul was suppose to HAVE a child that got killed...hence pushing him to go full holy war.
And, the whole thing with the family's declaring war did not happen either he just became Emperor.
On top of that...the ending is...completely changed. This whole thing with Chani going on her own...are they...are they going to have her fight against Paul?
She kept saying how its only a real freedom when her own pepole fight for it...they are not going to recon the whole series just to make Chani the true hero are they? That...that would be...a rather massive change to say the least.
I didn't mind Alia was changed, and I actually appreciated the Chani changes at the end. I don't think it's going to affect the next book adaptation as much as people are worried about. Remember Paul said he's seen the future and Chani coming around.
I do wish they had left Leto II in and made the time skip a little longer. I thought it was important in pushing Paul to leading the Fremen to attack.