Apple has issued a press release regarding the U.S. launch of the iPhone 3G tomorrow. Near the end of the release, there is a section called "Availability", which contained the following information.
So it appears the rumors were referring to the release of the App Store only, not the release of the new software. We shall wait one more day
EDIT: If the press release wasn't enough to seal the deal for you, this should do it.
Apple Press Release said:The App Store will be available beginning today [June 10] via iTunes 7.7 and part of the free iPhone 2.0 software update for all iPhone customers on July 11. iPhone 2.0 is also available for iPod touch users for $9.95.
So it appears the rumors were referring to the release of the App Store only, not the release of the new software. We shall wait one more day
EDIT: If the press release wasn't enough to seal the deal for you, this should do it.
Backup proof:
http://www.apple.com/mobileme/setup...&softwareVersion=2.0&os=Mac&osVersion=10.5.4& iTunesVersion=7.7