I noticed earlier today that the Roland booth at NAMM is also only by private appointment too. ( post )
There is a hidden secret side to all the big shows, with meetings and deals going all sorts of directions.
For instance there is private communication that goes on among the MIDI association members, particularly at NAMM. So that would be Roland, KORG, and Yamaha in particular, and others too. MIDI 2.0 grinding away.