Volume 2 (2015) came out a year after Volume 1 (2014) and does review Cup 4 Cup, but only recommends it with reservations (too much cornstarch; gummy texture) and doesn't cover Bob's 1:1 at all.

A third volume with updated reviews and recommendations would be awesome. Like I said, the flax meal they like for their whole grain flour mix is now unavailable, and there are a lot more gluten-free products and alternative flours out on the market now. I'm sure they could do amazing things with cassava flour.