Digit Life takes a look at the new driver architecture and graphics system in Longhorn. They have published a long article, explaining cryptic terms like Avalon, WGF 1.0 and 2.0, etc.
Lonhorn is a new operating system that will replace various Windows XP
modifications approximately in 2006. Unlike Windows XP and Windows
2000, based on different versions of the same kernel and having almost
identical driver models, Longhorn promises considerable changes not
only in its interface and API, but also in the heart of hearts of the
system, in the kernel, memory and source management architecture.