Apple is getting crafty and peppering an iOS 5.1B1 config file with references to fake devices. These bogus devices were discovered in the USBDeviceConfiguration.plist file and first reported by 9to5Mac. The file is reportedly one that many sleuths examine when they're looking for new device information hidden in iOS.
These bogus references are meant to thwart developers from looking any further, but it will probably have the opposite effect. Most developers will have a good chuckle at these fake devices and turn towards the lower level files where the real information can be found.