Nikon’s next professional DSLR the D4 should be coming in the 1st quarter of 2012 and the specs have been gathered from various sources. Here are the main ones:

 

Nikon D4 specs:

• 16.2 MP
• 11 fps
• 100-102,400 native ISO range, expandable to 50 and 204,800
• CF + XQD memory card slots! That’s right, the Nikon D4 will have the new Compact Flash XQD memory card slot.
• Compatible with the new Nikon WT-5 wireless transmitter
• Integrated Ethernet in the camera
• Face detection/recognition function that will be working in the viewfinder (maybe some type of a hybrid viewfinder? Nikon had several related patents)
• Improved video, I have no other details on that but my guess is 1080p/30/25/24 and 720p/60/30/25/24 similar to the Nikon D800
• Uncompressed video out through the HDMI port
• Ability to assign the two buttons on the front of the camera to smooth aperture control during video recording
• Improved 51 AF points
• AF detection range will go down to EV-2.0 (the D3s went to EV -1)
• Autofocus system: 9 cross-type sensors that are operational up to f/8

Although the D4 has lower specs in terms of megapixels than the D800 the D4 will be extremely fast and have a ridiculous ISO range.

(via NikonRumors)