My sources tell me that UPS has a 5 million sq. ft mega hub in Louisville, KY they call Worldport. It handles express and international packages. iPhone 4s's are being stockpiled there to be released Thursday for delivery Friday. They can process more than 300,000 packages an hour there, so the phones that are there will be delivered on Friday. It's called logistics.
http://en.wikipedia.org/wiki/Worldport_(UPS_air_hub)
Don't know what your sources are, but this sounds accurate. Here's to one more day of checking ups.app.