That’s the answer, courtesy of an Engadget interview with Apple VP Phil Schiller. Strangely enough, some thanks goes to those enemies of fair use, the RIAA:
Well, the RIAA wanted to be able to distribute ringtones of its artists without having to pay them big money to do so (surprised?), and it won a decision last [...]
Bob “SmoothSpan” Warfield calls it the “Multicore Crisis”. That’s the situation in which the effects of Moore’s Law have changed: while the doubling of transistors per chip continues, the by-product is no longer faster processor speeds but more cores per chips instead. He illustrates this point with the graph below:
Click the graph to see it [...]