so much Mechanicum awesomeness...
I'd be happy if they'd just release some heads for the Ultramarines based on those cool designs from the HH card game and Collected Visions. They're definitely taking their time with the books. But it makes sense. They don't want to dump too much product at once. You only have so much money to spend, and if the drag it out, they'll sell more copies of the books total, rather than people just picking up the books for the Legion they actually want.