I don't think any of your responses justify or explain the lack of documentation. MS is inviting developers to their new OS and Win8 now has a customer preview, with the developer one being out for a while. Pointing to a potential situation where MS might be criticised over hypothetical changes still doesn't negate the criticism of the very real problem of missing information right now. I find the idea that this can also be explained away by a desire to surprise/woo customers totally absurd given the release of installable Previews of the entire OS.