Appleinsider claims that "dark grey" or "gunmetal" colored slim notebooks have been spotted at Apple campus.
Though noticeably thinner but otherwise similar in size to the company's 13-inch MacBooks, the notebook appeared to have a metallic sheen to it, which set it apart from the current black MacBook.
The report is reminiscent of a 9to5mac report that indicated that new MacBook enclosures made of black and silver aluminum had previously been spotted by their sources.
Rumors of a sub-notebook laptop have been building as we approach Macworld San Francisco. Our rumor roundup summarizes the predictions to date.