The D1 series Nikons used electronic sensor timing above 1/250th. That meant that you really had an unlimited flash sync. About 1/1250, you started to lose flash power, as the shutter speed was shorter than the flash duration, but even at that speed, you had no shutter clipping of the image. While I don't believe that you can do the same thing with a CMOS chip, I can't believe that they didn't put the same thing into the CCD equiped D200.
If Nikon is planning a new model, the thing that will probably get them more business than anything would be the ablity to do full power flash syncing at 1/1000th, or even 1/500th of a second. David Buzzard's Technical Blog