Over the past bunch of months, the Razor project has been evolving, going through some changes and the like. I have not been as close to it as I would like. However, one of my fellow Rackers has and has put together a number of really good write-ups:
The first one should tell you quite a bit about what is changing and what is staying the same in the new version of Razor. The last one, should help you get started with it.