Nikon D700 and D300s are now officially listed as discontinued on Nikon’s website.
The surprise here is the phase out of the D300s, because I have not received any reliable information about a potential replacement.
I believe the D700 will be available for sale for at least few more months after the D800 announcement.
Update: I was told that the Nikon D700 is no longer on display at the Nikon flagship store in Ginza.