Diane Nelson is the President of DC Comics, so outside of Warner Bros., she is the most influential person on the planet in terms of getting DC characters onto a movie screen. And her first choice? Neil Gaiman's Sandman.
Of course, this is not an announcement of a Sandman movie. The Hollywood Reporter (page 2) merely asked Nelson what characters and titles she wanted DC to make movies of, her answer was this: "Sandman is right on top. I think it could be as rich as the Harry Potter universe. Fables. Metal Men. Justice League. And yes, I'm going to say it: Aquaman."
Obviously, Warner Bros. makes the final call, but the head honcho of DC announcing that Sandman deserves a movie is by no means inconsequential. Especially when you add this barely enigmatic tweet from Neil Gamiman:
I don't think we can say a Sandman movie is happening for sure, but I think we can safely assume someone's working on one. I also think Nelson is way too optimistic about Sandman reaching Harry Potter level — 1) it's too weird for mass audiences to make a long0running franchise out of, and 2) it's way too dark — but even a single Sandman movie would go a long way into helping DC catch up with Marvel, box office-wise.
Unless Warner Bros. got cold feet midway through and ended up giving Sandman that same treatment it gave Jonah Hex. Which is probably what will happen. Still, everyone knows it's nice to dream.