Well the guys over at Hell Boy II: The Golden Army put out a great little video of the Character Design Meeting for Johann Krauss. See the video [here] They talk about how they need the moving parts of the suit to move. I love the use of a lazy Susan to give a swivel look and feel. Guillermo Del Toro also insists that he needs a mechanism that will allow his gaseous form to escape the suit quickly. Hence the disc located on his left chest area. I'm guessing that means that we will get an opportunity to see Krauss outside of the suit at some point during the movie.