In the Sticky post. Also in all the Blue comments from the day of the Blog post where they kept locking the threads.
Your issue seems to be that the Blog post does not contain information yet about topics you are interested in. Feedback about what else you want to see covered in the Blog posts for future releases would go there.
You will not get any answers to those questions you have, here on the D3 forums. The CM will simply make sure the D4 team sees it. Many of your questions are either answered already - as far as they can - or will need to wait until the game is farther along.
We would all love that, including our CM. Having it all here makes it harder to follow and does not accurately reflect player engagement numbers. The only good part about using this forum is that you need a D3 license to post so it avoids some of the spam and trolling open forums come with.