The Warhammer News App today featured a free digital supplement from Games Workshop Digital, if you sign up for the GW Digital Editions Newsletter by this Friday. Of course I had to do it, as it features Ragnar Blackmane battling against Kaptin Badrukk during the Sanctus Reach campaign.
According to Warhammer News the supplement will contain a new mission, new datasheets, and background.
Here is a link to Games Workshop Digital where you can sign up for their newsletter.
Also here is what was shown on the app today for you to check out.