The extra hole mystery solved:
"A.I.R. side port provides immersive acoustic feedback for the player"
Kurt
That seems like a logical place for an extra soundhole. Kurt, you've likely noticed how much more sound is pouring out of the soundhole on the top of the guitar, it makes sense to point some of that towards one's ears.
Thans Kurt! Someone asked that in the live stream, but we never got around to answering. Glad I looked here. Another mystery is history.