Certainly the lighter the better would be the way to go.
I question the viability of the business model that says they have to buy a complete Macbook, Air, whatever and then throw half of it away to make the modbook. And we know Apple is never going to cooperate to make it easier for them.
As such they really would be best to make it a PC based unit that could be built from scratch from components that are best suited. Sad to say but true. It would be much less expensive and they wouldn't be hostage to Apples whims.
Given the fact that creative pros who opt for Creative Cloud can download both Windows and Mac version of CS6 there's no longer the issue of being invested in one system or the other which actually opens up a number of question for me about using Apple moving forward. Their apparent waning interest in the pro market is becoming quite dissapointing.
If I thought someone was going to read this I would have tried harder...