Go to the "TAMIYA NEWS: 44th Shizuoka Hobby Show" thread, click the link, scroll down down down and sort through the Japanese characters (they haven't updated the Shizuoka show on the English language site yet) and you see:
24282 ニスモR34 GT-R Zチューン【仮称】
Looks official to me?
I saw this car in Sport Compact Car, and admittedly, even though it's a Skyline, I immediately began thinking about how to convert my old, unstarted Tamiya R34 to it... now I won't have to! Count me in (hides).