Hi there. I don't know if any of this has been said beforehand, but the White Dwarf Weekly has been dropping some not-so-subtle hints that it may well be the Dreadnaught/Bjorn Combi-Kit as expected.
What isn't so expected however is this little snippit from the White Dwarf:
In the wake of the Horus Heresy, the Imperium lay in ruins, shattered by the carnage wrought by the Traitor Legions. Determined to prevent such a catastrophe from ever occurring again, Roboute Guilliman of the Ultramarines insisted that the strength of the Legions be divided into smaller forces, known as Chapters, so that no one man could ever command the unstoppable power of a whole Legion once again. While some accepted his wisdom readily, others railed against it. For the Space Wolves, there was no real decision to be made, for the Sons of Russ lacked the numbers of their brother Legions and so remained intact, retaining the same structure as they had at their founding - 13 Great Companies, each with their own Lord. In the long years since then, tragedy has befallen the 13th Company, but 12 remain until this day, each an incredible fighting force roughly equal in strength to a Codex Chapter's Battle Company.
Now I'll admit my Space Wolves fluff knowledge is rusty, but aren't they one of the few Marine chapters actually closer to Legion strength right now? Not to mention I don't recall them taking extreme casualties during the Heresy (in part because the only conflict I know of they partook in was the Burning of Prospero), and that the Salamanders and Raven Guard - who had similar if not greater problems, mind - would go on to have Chapters (even if the Salamanders ones are only guessed at).
I have a disturbing feeling if this isn't true or if something has changed, we're going to see some retconning the likes of which not even the Grey Knights have ever seen.
Then again - like I said - my Space Wolves knowledge is rusty, so I could just be misinterpreting the above passage as "suddenly, the Space Wolves adopt the Codex like everyone else seems to be doing!".
If I'm wrong, feel free to correct me or ignore. I'd rather not propagate info that turns out to be incorrect.