Step 1 - Go to Apple Store
Step 2 - Email yourself the image from the display mac
Step 3 - Post it here
Step 4 - Enjoy basking in the glory of all of our gratitude.
Not sure if the demos in the Apple store even have it though. It may have been something they just put on for the press event. My new MB didn't come with it, and I've never seen them unlock machine-specific wallpapers..