Like many Nikon users, I have been waiting for an upgrade to the D300 with the announcement of the D600 I am not sure this will happen.
Nikon claim the D600 is a wildlife camera, well with an unknown AF system, lowish frame rate, and no visible wildlife action shots in their press release (a static snowy owl doesn’t count in my book) 24mp pixels is welcome so long as there is no issues with noise. Pretty sure the AF points/zone selection is on the front of the camera in conjunction with one of the command dials as the D4/D7000 (massive backward step much preferred flicking the selection lever on the rear of the camera for AF point selection)
Also at a RRP of £1955 UK why would you rush out any buy one? Used D3x and new D800′s are around for just over £2200
Hopefully they will follow up with a D400s to sit under the D4 with say 16-18mp, 7fps, same AF system as the D4, FF sensor, AF selection zone lever on the rear, two CF or SD card slots and no over priced additional battery pack!
For those who want to read all the tech speak on the camera the link is here: http://www.nikon.com/news/2012/0913_dslr_01.htm or like me you can wait for feedback from someone who uses in it field conditions for wildlife action photography!