Games Workshop put the Island of Blood boxed set on Advance Order today.It's £60 in the UK and $99 in the US. Black Library have even released a novel called Island of Blood to coincide with the release !
If you order it in advance it's shipped for free and you should get it by 4th September. The mini rulebook is 200 pages long and you get a full colour 32 page guide to the Island of Blood (although I'm not sure exactly what that includes - presumably the background to an Island which has had a lot of fighting on it !)
All the details here:-
Image is © Games Workshop. All rights reserved. Used without permission.