Updated CPU For 360 Next Year
Next Generation reports that Microsoft has already lined up a new CPU for their next-gen console. Production with the new chip should begin next year. From the article: "Singapore-based Chartered has been a supplier of less-advanced 90nm SOI CPU products since the Xbox 360 console launch. By implementing the newer 65nm SOI technology, the system's transistors will retain less charge, allowing the microprocessor to operate faster."
Consoles don't usually change their cpu speed, but it will probably run cooler.