Book will be out on 6th October apparently, preorders going up on saturday.
Faeit212 has a lot of pics and rules from White Dwarf:
http://natfka.blogspot.de/My opinion on the new models: the Dragon looks nice (especially in the shot from above), the Raptors are amazing. Not sold on the Warp Talons, but that might be due to the paint job. Demon Engine looks freaking amazing in my opinion, both variants. The CC obliterators are terrible. Hate the faces. Could be fixed by swapping the heads for chaos terminator heads perhaps. Both the Sorcerer and the Aspiring Champion look great, and the Dark Apostle and Warpsmith are fantastic too. So overall I'm quite happy how they turned out.
As for rules, what I see so far I like. A huge Eye of the Gods like table, with mostly beneficial stuff. Psychic powers are a mixed bag, some very good, some quite meh, some plain fun (like the Tzeentch one that lets a friendly character roll on the Boons table). Marks and Banners look useful. Verhicle upgrades look useful. Special rules look useful. Hatred vs. Space Marines? Yes please.
So, I'm very much looking forward to actually reading the full book. Looks like my dear old Chaos force will be getting some serious love.