I'm surprised so many Apple experts are thinking that it's simply in landscape mode. The spacing is not consistent with landscape, and is consistent with portrait mode.
Some detective work (AKA screenshots).
See that cluster of 6 droplets, arcing up to 1, 2 o'clock?
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You don't even SEE those droplets when you hold it in landscape mode. To get the wallpaper, dock icons, and dock shine just as it is in the invitation, you have to hold it in portrait mode. To be precise, hold it in portrait mode, put 5 apps in your dock, put Maps, Calendar, and Keynote as your 3rd, 4th and 5th apps. And there you go.
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That would place the Home button (or FaceTime camera) directly under the Maps icon.