Product Transition Affecting Revenues
I would guess that Apple will be "transitioning" all of their software products to Intel-only, starting in Q4. They've already announced that the next version of OSX will abandon PPC, so I would expect that iLife, iWork and the Pro-tools suites will all go Intel-only with the next upgrade.
This would affect revenues negatively due to the smaller potential pool of buyers for these products, but it would aid Apple in the long run as they are able to add new revenue-generating features to the products, and lower development/service costs of having a single platform to support.