"The Xbox 360's solution to this problem is to store high-level descriptions of objects in main memory, and have the CPU procedurally generate the geometry (i.e., the vertex data) of the objects on the fly. So in the case of our forest, main memory stores information about the tree, like the type, size, location of each leaf, etc., along with other relevant data like the direction of the prevailing wind. This information is passed into the Xbox 360's Xenon CPU, where the vertex data that defines the polygons out of which the tree is made are generated by one or more running threads. These threads then feed that vertex data directly into the GPU (by way of a special set of write buffers in the L2 cache, but more on that later). The GPU then takes that vertex information and renders the trees normally, just as if it had gotten that information from main memory."
This will be an interesting advancement in gaming. Mind you look who will own this technique.
No two trees the same again! 
Sorry folks. 
How far could they take this? I can't imagine, for instance, it would replace designing a village in say Call of Duty, as one can't have randomness, or maybe for online this would be welcomed? For now it seems directed towards the smaller environmental elements. 
