Apple has a video on their website showcasing the unibody. The milling machine that the unibodies are being made in is covered in Chinese characters and the factory workers all appear to be asian.
Huh. I just remember the media event where it was introduced them talking about the almost fully-automated factory and how that meant it could be domestic. But if the rest is still made in China I suppose that doesn't make any sense. Must have been a rumor I misremembered.
So probably not.