With the new 10.6.7 update, I opened /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources, and what do you know: one of the icon files is called
AnonMac50
EDIT:
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Basically, this folder contains lots of image files needed for the system, including icons files for computers and other Apple devices. It says iPhone 4 Black, and while White isn't there yet, they wouldn't put Black at the end of the name unless a white one is coming, I think.com.apple.iphone-4-black.icns
AnonMac50
EDIT:
This is included in the latest version of the Lion DP. It also includes the LED Cinema Displays.com.apple.iphone-4-white.icns
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