I'm not surprised at all. I didn't have any faith in this when I didn't hear any good news for years. I don't think you can do just one film and have it make sense and do Dune justice, anyway. Three movies would have probably worked, though.
As far as combining Duncan and Gurney, that's ridiculous. Duncan becomes the most important character in the series and Gurney Halleck is one of my favorite characters. And I'm still upset no adaptation has done justice to Yueh or Thufir Hawat.