A new video is up on youtube showing giving us a teaser that there are definitely Dwarves coming in the next week or so. The date on it is Feb 1st, and since no pre-orders are aleady up, we can assume that the rumors are true for this army book release happening in the second week of the month instead of the tradional 1st Saturday.
here is the link to the video
http://www.youtube.com/watch?v=56Kd-A1RTJ4