Why would they "save the stuff for release"? Assuming they have the display space, what would they accomplish by keeping it in storage?
By putting them out early, they help create awareness for their new, expensive devices. They might even get some overanxious people to buy them ahead of time (and then they can order more and sell more). That laptop case looks very solid, and very attractive, so it's DEFINITELY good to have it out early even if they can't demo it. Hell, it even saves time to set up the display ahead of time as well. There's every reason for them to put it out.