From reading the statement is seems like this RAZA "prototype" will not be missing any gameplay or playfield feature mech "innovations", it sounds like robert is not classifying these aspects as "innovations" but merely what pinball already should/has had. Stuff that cost cutting by others has taken away.
I think the things missing that He calls the innovations will be alot of stuff inside, like operator features, servicability, playfield slide out/hang device, Augmented reality, VR, cabinet design.
System/Platform innovations, nothing missing that might impact on the ability to properly location test a complete, fully functional playfield/game in the public show setting. This scenario the bits/innovations that may be not revealed I guess may have little to nil impact on the ability to successfully fully test the Complete (with all the fantastic mechs) RAZA playfield prototype.
I dont think the insides of these games will be seen. Probably just in a standard generic cab, for testing the RAZA game on it's own.
Just my guess, based on the trickled statments.