We just had a set of them delivered to our lab, and when jcobleigh pulled the books out of the Amazon crate a few minutes ago, it was to a chorus of "oh mys" and widened eyes.
Dimensions: 9.2 x 6.3 x 2.2 inches
Weight: 3.2 pounds
It's basically twice the weight and size of the previous edition (3rd) that I had on my bookshelf.
That's a honkin' big nutshell.