Statement from Microsoft...
We congratulate Sony and Guerrilla Games for their efforts with Killzone 2, however this is only the beginning of a new wave. The current technology employed for certain unannounced Xbox 360 exclusives far surpasses what gamers have seen in any game so far.
Gears of War was the beginning of this technological benchmark when released on the 360 and this lineage will be carried forward in the following months with exclusives that shall stand for a new definition of gaming experience and provide stiff competition for the opposition.