Thanks to a copy of an email from AT&T to its employees, a number of blogs are speculating as to the date the iPhone will be released. The Boy Genius and others have concluded that because vacations have been disallow from the 15th of June through the 15th of July, the “obvious” release date is set in concrete. What may have been missed is there is usually a preparation period, such as inventory build up and distribution of advertising material, which requires considerable involvement. More …