Spoke with Alan Bligh at Games Day US (real nice chap), and he told me the following:
1. The deadline the fine folks at Forge World have given themselves is to have dolls for all the entries from the first Monstrous Arcanum book out by Summer 2013.
2. There's going to be a story-driven book like Tamurkhan released every one or two years with new dolls and rules and focusing on different armies (next one is Empire + Dwarves vs. Orcs + Goblins and it focuses on a single battle; but we already knew that). These story-driven scenario/campaign/rule books will come out alongside new Monstrous Arcanum books as they are finished.
3. Chaos Dwarf Bull Centaurs photos: https://plus.google.com/photos/11745...Mqi-s3j34TU5gE
live long and prosper.