A prior post mentioned this ("Access Control"), but I'd like to second the request for add'l info. What about security? Did I mention security? I'm curious about security.
Let's put it this way - pretend I'm a pit-stained Ballmer at the lecturn chanting, "SECURITY! SECURITY! SECURITY!" and the crowd is chanting with me in a "We want answers!" kind of way.
Butt seriously, it looks like a very intriguing tool, one that could potentially be used to handle a lot of development scenarios. But I hope that security isn't being left for V1+. If so, it'll be useless for even very small departmental apps.