It'a almost as if it's a tease to generate excitement, weird, I know. It's also pretty obvious why they would choose moody and dark lighting in which to reveal a new batman, but apparently that's a "gimmick"? It's
Batman darkness is his middle name.
We'll undoubtedly see full body's soon since they're shooting now, often when they release this stuff it's so that they can control the first impression when shooting in public places so that they can avoid well, something like this being your first look...