Apple is releasing an ultra-thin 15″ notebook in the beginning of March.

“Upstream suppliers of Apple have recently started shipping a small volume of components for a 15-inch ultra-thin notebook model from Apple in November and the device could be either MacBook Air or just a thinner MacBook Pro. The new MacBook is expected to appear as early as the second quarter of 2012, according to sources from the upstream supply chain.”

It is unclear if it will be a 15″ MacBook Air or a thinner 15″ MacBook Pro.

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