It says on Apple's website that the 15" & 17" MBPs change between IGP and GPU automatically, so this must mean they are using Nvidia's Optimus technology now.
Quote:
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Originally Posted by Apple
The 15- and 17-inch MacBook Pro models come standard with automatic graphics switching. It’s a breakthrough technology from Apple that switches graphics processors on the fly to give you performance when you need it (when you’re playing the latest 3D game, for example) and better battery efficiency when you don’t (such as when you’re reading email). MacBook Pro transfers the workload between the powerful discrete NVIDIA GeForce GT 330M graphics processor and integrated Intel HD Graphics so seamlessly, you won’t even notice.
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http://www.apple.com/macbookpro/performance.html
Or maybe they rolled their own solution?