Yeah but not surprising since it's a Japanese auto maker.

I have the Nismo and planned to add rear speakers when I upgraded to a Nav / DVD unit. The radio shop pulled the rear panels off to intsall them and "No holes for speakers". You would have to cut them to mount the rear speakers. I decided to skip that and am satisfied with the 4 in the front hooked to the new head. After all, its a small area, does not need alot of sound unless you plan to be aprked all the time.

Getting prepaired
 

I'm into highend audio so my older equipment will transfer, I just noticed the little rear speaker provisions tonight and thought maybe some extra tweeters.
My audio shop suggested 3 8inch subs rear facing, good esthestic size, but I have 1 good 12inch from the old car, 3 kicker amps, Boston pros {bugeye mount} I'm going to use a 2002 model Alpine 7977 with a kenwood EQ, wish me luck.

Well in my 350Z I had the same setup with rear speakers. They weren't great but they were there, so personally I was accustomed to them.