It appears that a higher percentage of iPad sales does bring down the total gross margin.

FORBES: Apple's Potential December Quarter Gross Margin

As a result, sales of used videogame products were 24.7% of fiscal 2007 (ended January 2007) sales, but represented 44.3% of total gross profits.

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Though shrinking due to piracy and streaming services, DVD sales generally make up a large percentage of the total gross for a movie studio, and animated films tend to do particularly well in this area.

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The movie franchise, once the money from this new picture is added in, will have rung up more than seven billion dollars in theatrical gross receipts, a total that will probably be tripled by television and by DVD sales and rentals.

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While there are higher costs associated as mentioned with all the new products and especially the iPad Mini whose sales have been very strong (which probably has lower gross margins than the iPad) I believe total gross margins in the December quarter could approach if not be higher than 40%.

FORBES: Apple's Potential December Quarter Gross Margin