Windows 8 unknowns still persist because Microsoft are still in early stages of development, so its pretty obvious that they aren't going to come out with a great deal of information regarding the OS, or be prepared to answer any questions on it. Not until it get's near to Beta stage anyway at least.

In terms of development, there are those who know exactly where about's Microsoft are, but that information is strictly confidential and leaking it would probably lead to more hassle than it's really worth.