Ok so i thought it was about time this rumour set got its own thread.
Rumoured release slot is between January-April 2013 (Hastings on Warseer says January) and will include both 40k and WFB books. It is also rumoured that BOTH are being written by (I believe it was) Adam Troke.
Now there are rumoured to be several new units making an appearence including a new Daemons exclusive Daemon Engine.
OK so summary of new units and kits being released alongside the Codex/Army Book:
New Daemon Engine
Khorne Charriot/ Artillery Platform
Chaos Furies/ Warp Stalkers
Plaguebearer Cavalry unit (said to be riding giant flies)
Plastic kits for all 4 Greater Daemons
Finecast Sculpts for existing Named HQ choices that as of yet dont have models...Skarbrand and Ku'Gath?
So there you go, while im a bit sceptical about the Plaguebearer cavalry and i dont think all 4 GD's will be released in the initial wave i think what we do get should be really good and im just hoping that this release comes sooner rather than later.