According to an internal AT&T memo that Boy Genius Report obtained, the carrier is making very similar preparations for "an exciting new promotion/product launch" right around the one year anniversary of the iPhone in June. AT&T sent a memo to employees discouraging them from taking vacations between June 15 and July 15. The 3G version of the iPhone is expected to launch during that period and AT&T said it expects "heavier than normal customer traffic" in its stores during those four weeks. The memo, however, does not specifically announce the coming of a 3G iPhone. The iPhone 2.0 software is also set to launch this summer and the company believes the new software will make the iPhone more appealing to the enterprise.
Many industry pundits expect a 3G iPhone announcement during Apple's World Wide Developer's Conference, which starts on Monday, June 9th. Apple CEO Steve Jobs usually delivers his keynote on Tuesday mornings (incidentally, Apple also tends to announce and release new products on Tuesdays).
- read this report from BGR