A reader sent me the following email:
"I know a nikon ex-employee who imports goods directly from nikon japan to the far east, she said she has ordered 50 SB-900 to be delivered next month."
I guess the same reader send the same email to few other sites. The only difference is that some blog(s) Publish his real name (oops!). Now you judge about the authenticity of that rumor. I am suspicious that if something is announced on July 1st, it will be available the same month for delivery. I also don't believe that Nikon will let anyone pre-order equipment before the press release.
Nikonrumors.com will never publish your email without your permission and will never post your name online. Just for the record. So if you got any rumors - send them over (email is on the left side).