I've watched the Lynch film, mini series, and read the first 3.5 books. All were OK, but seemed to fall short of what they could have been. I can't say I'm really that excited about yet another production.
Someday I would like to go back to the book series. I've been told that it picks back up a bit, and right about where I left off is the low point. My understanding is that it takes on more "universal scale" themes later in the series...? (And also that Herbert never finished it before he passed...?)