Cross-posting to proofreading:

I notice that man-stopper ammunition has reverted to its pre-errata DH version, where Pen is increased by 3 (and not increased TO 3, like it has been in all the other games).

Is this correct?

The are a few things in OW that ring back to pre-errata Dark Heresy, Chamaleonine being an egregious example, so I just use the errata'd version.