http://www.apple.com/powerbook/

New laptops from Apple.

The 15" and the 17" models are compatible with Catalyst and pixelmad.
You should be able to drive an external monitor from one of these things - though this is not tested.

The new iBooks with the 9200 graphics may also work with pixelmad. Not tested. And not likely to be tested by me.
http://www.apple.com/ibook/

You will not be able to drive 2 monitors from the iBook, they dont have enough graphics memory.

Your playback performance will depend on the drive system you use.
Internal drives arent great at doing video.

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No testing has been done to determine the suitability of using these systems.