7 pin is only needed for phantom power, i think midi only needs 3 pins to work, 5 allows bi-directional. The stuff RJM and FAMC needs is the specification (documentation) about the changes made to the MIDI in the III. This will allow them to make the tuner work, button states, patch names, and i'm sure other goodies. It's been requested weeks ago, and nothing from the Fractal camp.
I will speculate (only thing we can do without word from Fractal) that the reason for not providing it is that it's not finalized, and will probably be finalized after the FC's release, at least enough to give to third party developers. Heat shield activated.