[UPDATE!]
ITS OFFICIAL!!
Rejoice, rejoice! and again I say rejoice!
Rejoice fellow NIKONIANS!

Nikon D700 Key Features from dpreview.com
12.1 megapixel full-frame sensor (8.45µm pixel pitch)
Image Sensor Cleaning (vibration) *
ISO 200 - 6400 (with boost up to ISO 25600 and down to ISO 100)
Also supports DX lenses, viewfinder automatically masks (5.1 megapixels with DX lens)
14-bit A/D conversion, 12 channel readout
Same ultra-fast startup and shutter lag as D3
Nikon EXPEED image processor (Capture NX processing and NR algorithms, lower power)
New Kevlar / carbon fibre composite shutter with 150,000 exposure durability *
Multi-CAM3500FX Auto Focus sensor (51-point, 15 cross-type, more vertical coverage)
Auto-focus tracking by color (using information from 1005-pixel AE sensor)
95% coverage, 0.72x magnification viewfinder *
Auto-focus calibration (fine-tuning), fixed body or up to 20 separate lens settings
Scene Recognition System (uses AE sensor, AF sensor)
Picture Control image parameter presets
5 frames per second continuous with auto-focus tracking*
Optional MB-D10 Battery Pack (same as D300), increases burst rate to 8 fps *
UDMA compatible single CF card slot *
3.0" 922,000 pixel LCD monitor
Live View with either phase detect (mirror up/down) or contrast detect Auto Focus
Virtual horizon indicates if camera is level (like an aircraft cockpit display)
HDMI HD video output
'Active D-Lighting' (adjusts metering as well as applying D-Lighting curve)
Detailed 'Control Panel' type display on LCD monitor, changes color in darkness
Magnesium alloy body with connections and buttons sealed against moisture
Improved Info display on main screen *

* Different to D3

Read more at: [link]
Hands-on review!!!

What are your views?