Vornheim: The Complete City Kit has charts on the covers (and one on an inside cover). You roll dice on the cover and read where they drop. It's cool.
If you pre-order Grindhouse + Vornheim, you'll get those three charts on a double-sided A3 sheet. Two of the charts will be twice the size as on the physical Vornheim book, and one chart will be four times as large.
But wait! There's More!
The first 100 people to pre-order Grindhouse + Vornheim get an extra copy of the Rules and Magic book at no extra cost.
That's a 168 page perfect-bound book that includes an 8-page full color glossy section. No, it won't fit in the box with all the other stuff, but now you're just being picky. :P