How many squadrons did it fill out? as I pointed out in the Ki-84 Otsu thread, Japan had no problem producing airframes, however engines were a different story.
They could of had 214 empty frames.
I'd have to do more research. It fought at Okinawa but the Japanese considered it a useful type and retained most of them in Japan for defense against the expected invasion of the home islands.
So far as I know all the Ki-102s were functional. It didn't use the Nakajima Homare engine like the Ki-84, so engine shortages might not have affected it. Looks like it used the Mitsubishi Ha-112 engine, which was also used by the Ki-100. If they had the engines available to re-engine the engineless Ki-61-II airframes with it they likely had the engines for the Ki-102.
Incidentally, Wikipedia says 238 were built.
EDIT:
All the photos I can find, even the pile of them after the war, are all engined. It is a pretty attractive looking airplane actually.