Sounds like it would be wrapping up the Paul Atreides story, and laying the groundwork for the Emperor of Dune Saga in the last 15-30 minutes of the film. That should still be enough time to deal with Paul Atreides.
The only certainty I read is that Villeneuve doesn't want to do children of Dune or beyond. But producers want mini series out of those and a Bene Gesserit prequel series that's already on the works.