Preview at WWDC likely in June, followed by September launch.
New Photos Indicate Previously-Thought NFC Chip in iPhone 5 is Earpiece Speaker
Despite the fact that the square feature is slightly off-center with respect to the device, we've assumed that it must be the earpiece speaker, and consultations with experts at RepairLabs have suggested the same.
Assembled front panel with earpiece bracket removed – bracket and speaker at right
Sonny Dickson has now posted a new set of photos of the assembled front panel that shed some additional light on the situation. A couple of the photos show the square bracket having been removed, and one photo in particular contains a partial view of what does indeed appear to be an earpiece speaker.
Closeup of front panel with bracket and speaker removed and front camera folded back
Apple is expected to introduce the iPhone 5 at next Wednesday's media event.