Looks like this is the real deal. Hopefully so, after that Red Herring we all were fed in July that had me thinking the album would be out on the 7th of that month.
Almost as exciting was the news about Nachtmystium's upcoming follow-up to Assassins: Black Meddle, Pt. 1 - did anybody catch that? It's one of the announcements as you scroll down the page to get to the Slayer story.