From the update:
As mentioned above, each week we will concentrate on a certain aspect of the Dark Heresy Second Edition rules that we would like you to focus on testing in that week. This will allow us to take a deeper look at individual features, and help facilitate more in-depth discussions. Keep in mind, however, that these topics are just the focus for the week, and you are welcome to continue testing whatever aspect of the rules you wish at your own pace. Any and all feedback is welcome at any time.