The Call of Duty: Modern Warfare 2 blog, FourZeroTwo, was updated a short time ago with a look at the game's texture streaming technology. This new tech, added for Modern Warfare 2, ups the graphical ante beyond what was seen in the first Modern Warfare.
Side-by-side comparison, Streaming On, Streaming Off
Read more about it over at the IAMfourzertwo blog.
A major component in the new engine tech that has the greatest impact on these enhancements is our new hi-res Texture Streaming functionality. Texture streaming allows our designers the freedom to make much larger environments, like the scene below, while also increasing the amount of detail on the characters, and environments in the vicinity of the player.
Side-by-side comparison, Streaming On, Streaming Off
Read more about it over at the IAMfourzertwo blog.