Preview at WWDC likely in June, followed by September launch.
iPhone 5 Logic Board Shows A6 Chip, Qualcomm MDM9615M LTE Modem, Hynix Flash
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Beyond the A6, the new photos also show that the Qualcomm chip located opposite the nano-SIM tray from the A6 is indeed the MDM9615M modem, which has long been rumored as the chip to supply LTE compatibility for the iPhone 5. As noted in our forums, Apple's leaky search engine has also just revealed that the company will be posting a page addressing the new iPhone's LTE capabilities.
The other side of the logic board reveals flash memory from Hynix, as well as several other chips from the likes of Murata, Skyworks, and Avago supporting such functions as Wi-Fi/Bluetooth, power amplification, gyroscope/accelerometer, and more. Apple has been rumored to be cutting back on Samsung memory orders, but the presence of Hynix memory is not explicit proof of such a move given that Apple has long sourced memory from multiple suppliers as seen in teardowns showing memory from Samsung, Toshiba and others at various times.