According to the Amazon.co.uk projected release date of certain big-name manuals and user’s guides for Mac OS X 10.7 Lion, such as Mac OS X Lion For Dummies, it seems quite possible that Mac OS X 10.7 Lion could release on July 28th, if not a week or two sooner (occasionally such volumes are delayed for last-minute editing).
Take this report with a grain of salt, however, as the US listing from Amazon reflects a projected release date of August 16th. Personally, I was hoping for a WWDC release in June, along with the iPhone 5, which is still technically a possibility, but now looking a bit less likely.