First up was more concept art. Back in December an image of the Codex Chapel Entrance was released. I liked it, but it wasn't much. More has been revealed. I love the fact they actually did concept art for something as small as a bolter pistol.
There was also a video and article about the Facial Capture technology being used for the animation of the movie which looks really good.
Man, just the idea of concept art for little things like Bolter Rounds (not to mention the crazy cool details like the "For the Emperor" on the casing) gives me hope they are doing right by this movie. I highly encourage checking out the pages and seeing what they are up to.