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 MDP. 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.