In my opinion, the functions and features of D7K hits very near to that of D300s (some features better than the latter), so price-wise - it is quite justified.
When D7K was first announced, the features that most impressed me (still am) over D90 were (not in order of pref):
1) 100% VF
2) 39 AF points
3) being able to meter with 9 legacy (AiS) lenses
4) Native ISO from 100 to 6400 (D90 was only 200 to 3200, same as D300s)
5) Dual SD card slots
6) Half-mag-alloy body (D90's plastic)
7) Not to mention lots of other in-body program / control settings for extra fine tunning that's unheard of in D90
8) 6 FPS (not as good as D300s, but a whole lot better when compared to D90)
9) Weather proofing
Therefore, is D7K a true replacement for D90? Not really sure, I'm sure till this day there are some who are still contemplating between D7K and D300s (wondering when D400 will come), and not between D7K and D90. The jump (if you look at the above improvements) is too great for D7K to serve just as a replacement for D90... If you ask me? Who knows, there might be a dumb-down version of D7K - D6K perhaps? Then it would time for a swan-song for D90.
