Apple's iPhone 4.0 sneak preview event invitation features the number four, though its shown in the corner, mostly cut off, identifiable only by its shadow.
The iPhone 2.0 event featured a road map apropos of the SDK introduction. The iPhone 3.0 event featured blueprints, perhaps a nod to the construction going on within the OS.
What then to make of iPhone 4.0's artwork? Dieter stared at it for a couple minutes to glean what he could and came up with this: the 4 is in the background. Shadows are typically in the background.
Are we reading too much into it? Are you reading something different? Share your best guesses in the comments!