Didn't the deadwing become the "deadwing" when all of the company was lost on a space hulk? And then they started the whole we paint ourselves bone white thing?
With Dark Angels there can be some interesting heretical relic stuff involved in the story due to their history during the heresy.
This is like best gaming news in recent months to me. Streum On making W40k game? Yes, yes, million times yes. I just a bit sad that they're making game based on Space Hulk, so probably no Jumpjets.