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The source, who wished to remain anonymous (to keep his job), could not disclose details about the Mac Mini other than its upcoming announcement at Macworld Expo, which begins Jan. 5. That's where CEO Steve Jobs traditionally launches major products during his famous keynotes (assuming he does indeed show up).

An upgrade to the Mac Mini is long overdue: The product hasn't seen a refresh since August 2007, and Apple computers normally have a life cycle of roughly six months. This long period of silence led many to speculate that Apple was going to drop the Mac Mini from its product line. However, Apple has shown no signs of discontinuing the product. It's also noteworthy that although Apple has been quiet about Mac Mini sales numbers, the diminutive desktop appears to be selling quite well. For example, the Mac Mini has been among the top 5 of Amazon's best selling desktops; it currently stands at No. 3.