There is a new teaser video that was released yesterday for the Militarum Tempestus. It really isnt much, and with all the leaks and information yesterday its really on the bottom of the news pile. Definitely though, check it out, and get ready for some great Guard action this coming month.
Here is a link to the Youtube page of the video.
http://www.youtube.com/watch?v=euIor5qdbhc