L1CK, simply put beta chat is for beta members only and as such is best done on the official beta forums. Regardless of there being a private section or not, TOG respects the intellectual property of developers and as such, the NDA of any beta for any company will be respected here.
With this said, as part of the beta invite PM, (yes, I'm in the beta also) the PM goes into details about what you can discuss. For the most part this is anything that has been released publicly but also about the game in general. For the most part, this has been pretty much what you guys have been discussing in this thread. The last few pages though have been getting to close to specific details about the game and this is specifically restricted. An example of specific details is the post you and Leevers made just prior to my own one regarding WP's.
If you are still not sure of what I mean, drop me a PM and I'll go into more detail.
"So Shines a Good Deed in a Weary World" - Willy Wonka