Boxes of MacBooks Arrive at Apple Stores

We've heard multiple reports that shipments of MacBooks have made their way to Apple Stores with specific instructions that they are not to be opened. While it was originally presumed that these new MacBook shipments simply represented MacBooks with Leopard pre-installed, the instructions not to open the boxes raises some questions.

We've heard various (conflicting) claims that they represent the upgraded MacBooks we've been waiting for, but we're not sure why Apple would ship them out so early.