Bottom line is: You don't want to hear about concepts. Concepts never manifest 1:1 in reality, so it is pointless to talk about them unless you want to be disappointed and think "how X could have been if only......". Realizing the concepts takes time, and only near the finish line can they seriously sit down and talk to us about the features.

It's even more problematic with the rehauls as they come in two parts. Even when the first part is done it's still kind of iffy and may not end up working like they thought. Determining what can be and has been already realized and what is still a dream in Matsui's head is not simple. Specific features such as death penalties are easier to plan, but they do not have such luxury with the majority of the combat rehaul. Everything is being changed simultaneously, and it is a fluid process. You change X, you affect Y Z and C. If D doesn't make it, F has to be left out as well.