Xbox One gets a CPU speed boost to go with its faster GPU

"We'll announce a launch date shortly," said Mehdi. "We recently just went into full production, so we're now producing en masse Xbox One consoles. We've had real good progress on the system. In fact, we just updated the CPU performance to 1.75 GHz on top of the graphics performance improvement, so the system is really going to shine [and] the games look pretty incredible."

http://arstechnica.com/gaming/2013/09/xbox-one-gets-a-cpu-speed-boost-to-go-with-its-faster-gpu/