Tinhte are back with a white iPhone 4 runiing iOS 4. From the looks of things, iOS 4 could have lost the Spotlight search menu from the iOS 3 days and the iOS 4 multitasking instead could have been an Expose multitasking page with a Spotlight menu at the top of the display.
This particular phone is running an Apple-internal application called "Radar" in addition to a game called "Tough Fighter," a game Apple actually built to show off the iPhone's accelerometer and graphics performance at one of their early SDK keynote. Some of the settings menus also look pretty internal
Facebook integration in iOS? It's probably integrated nicely with Media Stream for photo uploading and such.
Another video below, shows off some of the device's hardware: it's 64 GB and obviously a prototype based on the camera and buttons designs. And, iOS 4 could have brought a brand-new home screen folders interface.