It is updated regularly, and has made a number of interesting observations about the kit and bot itself.
I will certainly be reading it, and of very great interest is the most recent announcement: http://thenxtstep.blogspot.com/2006/03/back-from-vacation-and-mdp.html
The author, Jim K, of Atlanta, has been accepted into the The Mindstorms Developer Panel. So we may expect to hear much more interesting info from him. There are already a number of tasty tidbits about the system there.
Coupled with http://legoeducation.typepad.com/, which is an official Lego blog which I have referred to before, and Lugnet Robotics , there is a growing surge of information, and very likely a coming surge of interest in robotics at its release as was evident with the original RCX.
Stayed tuned - its all about to get very much more interesting.