Don't get your hopes up. In fluff terms, maybe. Actual worldwide campaign? No. They wiped out SoC and Abaddon's 13th Black Crusade with claims that there were fishy results and it's too easy for people to cheat, stuff like that. If that's the attitude they've taken recently, then I can't imagine them opting to try the same thing over again, because the results will likely be similar, and then they'll just retcon it again.
Instead, we're just seeing WFB brought up to the same situation 40K is in: Everything is bleak and dark and if the story progresses forward at all, it'll be to see everyone die.