Apple will introduce new versions of iOS and OS X at its annual developer's conference.
Apple iPhone Displays at Apple Stores (and AT&T Stores) [Updatedx3]
The displays have been revealed at other locations and show large video demonstrations of the iPhone:
Photo courtesy of sminman
We'd heard rumors that Apple Stores would be getting more promotional displays this Friday, and there had been hopes (though unconfirmed) that iPhone rate plans details would also be announced at that time.
Update: Pulse took these photos at the Apple Store in Hollywood. It appears to have a power cord: 1 2 3
Update 2:: Some more photos, courtesy of sminman:
Update 3: AT&T stores also got their own iPhone displays installed overnight.