Two 3G models are being released along with the iPhone 2.0 software that allows 3rd party developers to write software for the iPhone which will be distributed by Apple within the new App Store also launching on July 11th.
In addition, MobileMe was announce at Apple's WWDC. MobileMe essentially syncs all your Macs, PCs and iPhone email calendar and contact data.
The iPhone will be available in two models, an 8GB for $199.00 and a 16GB for $299.00.
Erik