Nikon just announced today the soon to be released D700 to fill the gap between the D300 and the D3.
Price is set to $2999.99 body only or $3,699.99 with a 24-120mm lens.
12.1-megapixel FX-format CMOS sensor with a sensing area of 36.0 x 23.9 mm; a sensitivity range of ISO 200 to 6400; continuous shooting at up to 5 frames per second (and up to 8 fps with the optional Multi-Power Battery Pack MB-D10; Nikon's exclusive 51-point AF system; Scene Recognition System for optimum autofocus, auto exposure and auto white balance detection – these are but a few of the advanced capabilities of the extraordinary new D700.
More info here:
Now Canon will finally have to announced the 5D replacement.