GameInformer received a memo pointing the way to The Aperture Science Surprise Deployment Initiation System, which offers a countdown with a bit over an hour remaining. The memo indicates this has something to do with "Pneumatic Diversity Tubes," prompting GI to speculate this is a Portal 2 DLC release. At first glance, it doesn't seem that domain is registered to Valve, however. We shall see what comes of this.