Tada-san has said in many interviews that there are manual prototypes that are testing.
However, just because there are prototypes doesn't mean that it will make production.
Case in point:
Convertible, shooting brake, hybrid, and turbo versions of the 86 were also confirmed to have working...
JDM does not automatically equal reliability. There are a number of trash cars that came from overseas.
Now if you want to switch the topic over to long term reliability on the J29, the jury is still out.
Can be yours for the low price of $300k.
I'm assuming you are talking about the blue and yellow one? From what I understand those two are hand built pre-production cars and not everything works on them. I also wouldn't be surprised if the final tuning and calibration are set.
If we turn back time it was about 6 months after the J29's...