A few key things to note:
A product transition (transition = change) will substantially affect margins.
Firstly, I believe we are talking about a significant change/upgrade to a current product (hence transition). Secondly, the transitioned product is most likely a computer as they are responsible for 60% of profits. Nextly, it would have to be a "top selling" computer; macbook/pro line should be selling in high volume with the back to school crowd and free ipod deal.
Thus, the first "conclusion" is: a significantly upgraded laptop line, with upgraded Mac Pros also a possibility.
Lastly, the decreased margins could be due to either a drop in price, an increase in costly hardware, or both. As Apple's business model tends to sell premium, high-priced products in low volume (rather than high volume cheap products) it is doubtful that they will drop the price. This is highlighted by their good profits last quarter (if people are buying their products, why drop the price). However, with the move to intel chips direct comparisons between Mac and PC hardware are transparent. The PC's are undercutting Apple's prices and delivering superior/equal hardware. People are more than happy to spend 1,200/2,500 on a macbook/pro, especially if they are getting ~1200/2500 worth of product. But now we are paying a premium price for inferior hardware.
I see Apple performing a significant technology upgrade on their laptop lines so that the premium price again gives premium hardware. Thus, they would still be making premium computers but will not leave a "umbrella" for price cutting by other manufactures.