Things just got interesting again. Yes, as has been rumored and leaked for several weeks (months?) now, Nikon just officially unveiled its new flagship professional digital SLR: the Nikon D4, which uses a 16.2-megapixel FX-format (aka full-frame) CMOS sensor that can shoot at up to 11 frames per second and capture full 1080p HD video.
“The D4, which is the successor to the 12.1MP D3s announced back in 2009, will start shipping in late February 2012 for $5999.95. So start counting your pennies now!
The announcement of the new Nikon D4 comes several months after Canon also announced a new flagship professional DSLR, the 18MP Full-Frame EOS-1D X. Though the 12-frames-per-second shooting, 1080p-capable Canon 1D X was announced back in October, it won’t start shipping until March 2012 and will sell for quite a bit more than the Nikon D4: $6,800.
The Nikon D4 will makes its debut at the CES show in Las Vegas next week.” By Dan Havlik..………..MORE

Nikon D4 Specs
• 16.2MP Full-Frame (FX-format) sensor, sized at 36 x 23.9mm
• 91,000-pixel sensor dedicated for 3D Color Matrix metering to assist with autofocus and scene recognition
• EXPEED 3 image processor
• Back-illuminated buttons
• 51-point AF System which is same as in previous model but with new cross-type sensors
• ISO range from 50 to 204,800
• 10 frames per second still shooting for up to 200 JPEGs; 11 fps shooting but focus and exposure are locked at the first frame
• Full 1080p HD video at 30p; 720p shooting at 60p for slow motion
• 0.012 second start time; shutter lag rate at 0.0042 second (same as previous model)
• Two memory card slots: one for CompactFlash cards, the other for new XQD memory cards
• 3.2-inch 921,000-dot LCD screen on back
