A pretty darn good theory about where Apple is headed from Gruber:
Apple now owns and controls their own mobile CPUs. There aren’t many companies in the world that can say that. And from what I saw today, Apple doesn’t just own and control a mobile CPU, they own and control the hands-down best mobile CPU in the world. Software aside (which is a huge thing to put aside), it may well be that no other company could make a device today matching the price, size, and performance of the iPad. They’re not getting into the CPU business for kicks, they’re getting into it to kick ass.