Since Sony made their PS3 announcement yesterday, lots of people are wondering what the official Xbox response is. Well here you go: 

This announcement certainly doesn’t change any of our plans.  We’ve blasted out of the gate with the greatest launch in the history of video games and we’re keeping our eyes squarely fixed on today and on the Xbox 360 road ahead, including continuous new content and programming through our premier Xbox Live online gaming service, the delivery of 80 high definition games and shipping between 4.5 and 5.5 million consoles by June.

This may come as a shock to folks, but Sony tends to not share their launch plans with us in advance. ;) We're continuing to stay focused on Xbox 360.