The question now is whether or not Dune 2 will actually happen.
Again, officially speaking, a sequel isn’t in the cards right now, but Denis Villeneuve has said he’s “optimistic” that Warner Bros will move forward it.
That thought is strengthened by the fact that at a special IMAX screening this past summer showing Dune’s first 10 minutes, the movie was labeled as Dune: Part One, indicating that WB is at least thinking about delivering a Part Two. Still, it’s likely the studio is waiting to see how Dune performs both in theaters and on HBO Max (you can sign up for the streaming service with this link) before deciding on the sequel one way or the other.