MacBook in short supply, stirs rumors of imminent refresh, rebirth of white plastic?

We've already seen the MacBook Pro sporting new specs, and heard rumblings of a MacBook Air refresh coming soon, and now reports of dwindling supplies of Apple's great white hope have the internets abuzz over a possible MacBook upgrade. AppleInsider did a little digging earlier today, and found that major online retailers, including Amazon, and at least one brick and mortar store were either running low or completely out of the last of the MacBooks. A similar fate has befallen stock of the Mac mini, inviting speculation that both machines will likely pop up post-Lion. We suppose there's also a possibility that Apple's ready to send the old workhorse to the glue factory, but we'd prefer a happy ending.