Nikon seems in no hurry to replace the D300S, which looks like a dinosaur next to the 7D and despite what you read on this forum, Canon's current 18 mp sensor can still hold its own against the newer sensors.
Nikon are still selling the D90, and that can only mean folk are still buying it!
I've got little to complain about with the 18Mp sensor. Took great photos for me in 2010 and still takes then today, in my 600D and no doubt in my M when I get it (hopefully, interested to see the difference digic 5 makes)
I've read that the Nikon 16MP has more dynamic range, less noise, I've read that the 24MP APS-C sensor from Sony is something else.
But you know what? I really don't care. I can work my camera, and I can work PS. The folk who lie awake at night dreaming of having 33% more pixels spread over an inverse square, wow!, thats like what? a 16x11 print vs a 15x10? 33% closer at full size view on your CRT?
And of course these folk who care so much about dynamic range also care about accurate filtration, nice glass lee soft grads to get even more out of that extra stop DR?
Listen, I've seen some of the work by some of the folk with the biggest technical gripes on here, and some of them even shoot with the best gear available, and yet whisper this bit, quietly, discreetly... I think I'm missing something... it's almost as if some folks care more about Nikon and DXO than they care about the act of taking a decent photograph...
I entirely accept my limitations, and that of my gear. My 7D is a much better camera than I am photographer. I'm sure the 7D2 will be better again. How much redundancy does one need? Although if it has a headphone socket I might buy it.
The 7D was and remains a class-leading camera. I'm sure the new tech will be swell, but I'm not going to sob into my pillow worrying about it.