22nd
According to Thom Hogan, “Nikon seems to be saving up its big announcement for the Osaka Games (starts August 26th; the formal announcement is apparently scheduled for the afternoon of the 23rd in Japan).”
The afternoon of the 23rd in Japan is later tonight for us (Tokyo is 16 hours ahead of Phoenix).
“Curiously, what we’re about to get appears to be what photographers (other than me) asked for: ISO improvements. By taking the pro body to a full frame, improving the sensor technology, and not pushing the pixels too far upwards, high ISO noise should be relatively well controlled. Indeed, if rumors are correct, Nikon will be allowing you to go to ISOs you didn’t know existed (couple that with some of the classic fast Nikkors and, well, so much for carrying the SB-800 with you). Personally, I’ll be looking closely at the base ISO results, as that’s what will drive my use of the camera. Likewise, the new autofocus system will get a lot of my attention, as it marks a dramatic change for Nikon.”