Like sand through the worm, there's a lot of stuff happening. I feel a truly mythic level of story telling happened. Bombastic, and earnest in a satisfactory package.
Dune is at its heart, a story about the garden of Gethsemane, wrestling with the destiny shown before you. Its also about women telling you what to do. Paul loves these people, and you can see the distance that his destiny will impose. A key image of this I think can be found at the very start where the fremen dehydrate a still living harkonnen soldier. The resource harvesting is done to all.
Being fremen is a key theme if this story, with the intergalactic politicking being a side issue, a mere falling red flag for the raging bull that Paul must guide. He is at the center of this mass of energy, and it must go somewhere.
I desperately missed St Alia-of-the-Knife, but I liked the scheming conversations between Jessica and Alia, the Bene Gesserit firmly on the distant side of the messiah human dichotomy.
The tragedy of the dunes is how Paul becomes distant from his fellows, so this is definitely written for Zebras. Frank Herbert? More like Frank Herdbert.