It's nice to see a "rumor" site who mentions its sources...
D600 seems commercially more attractive. Faster, more Mp, more AF points and... available next week
■A new 20mp sensor
■Full Frame
■4.5fps
■ISO Range 100-25600
■DIGIC5+
■APS-C Sized body
■Weathersealed
■SD Card
■Built-in Wifi & GPS
■11 AF Points, f/2.8 Cross-type in the center.
■3″ LCD
■Full HD (1920×1080)
■Available December 2012
■Price: $1999 USD Body Only (Speculated price)
This very probably doesn't mean anything in real use though...