Havnt seen Duncan Jones' earlier films, but then the producers/ company can really put halters on a good director. And even a good writer/director can have do poor stuff. James Cameron had put out some pretty original things, and then he goes and writes/directs Avatar and while visually stunning, the story is so flimsy you couldn't use it to wipe your ass.
Thus the "Game of thrones and Avatar" tweet has me worried. Does he mean gritty and well written fantasy with members from different races whose cultures will be brought to life in a stunning way? The quality of storytelling in the two are pretty far apart. Im not convinced its not gonna be "some dudes with swords anna dwarf and some chick with dragons in a really predictable story."