Also, Villeneuve has said in interviews that he had always envisioned 3 films.
Which makes complete sense, since the original Dune novel is split into 3 defined sections.
This was why I was hoping for just a little bit more in the first movie, because this one ended in somewhat of a non-organic place in the flow of the plot. The way things need to go, there will be a bit of a timeline hiccup when the next part comes out. Eagerly awaiting Oct 20, 2023 (which will also happen to be my elder son's 21st birthday).