Maybe, but I doubt Apple over-estimated the sales volume on the previous models. If they had, they would have posted losses for those machines each quarter. IIRC, this didn't happen. So what ever the quantities sold, a profit was made.
Granted, given the current economic situation, the sales quanitity would be expected to drop somewhat. Then there's the currency exchange rates, increased shipping costs, and labor costs have been on the rise in China. But I'd need to see the math that justifies that much of an increase.
Then look at the other vendor's pricing. Their systems are made in the same countries, etc., so they're in the same situation as Apple as far as per unit costs. So until I see the math proving otherwise, it still comes down to an increase in margins, as I can't think of anything else that's realistic.