There is a massive set of leaks going on right now for the Curse of the Wulfen. A lot of information is out, including Formations, artwork, and one page that if you don't want the backstory spoiler... dont read. This literally could be the biggest event since the Horus Heresy.
Please be aware there are huge spoilers here in these leaks! I am just digesting them, and wow. It is as we heard from the novels........ There are some very sweet formations in there. Wishing I was a wolf player.... well maybe not.
Leaks via Lady Atia