If you are unfamiliar with Matt's playing, rectify the situation here. I have been loving his playing for just over a year now. He is one of the most organic improvisors I know of today as well as being one of the most generous.
The idea of an entire book on one particular scale (Harmonic Major) is very interesting. A quick look leads me to believe that there will be much to mine here.
Congrats, Matt...I'll be ordering one soon!