Regarding dark mind, I doubt that. Patreon would absolutely murder them if they did release it included. We'll probably need to install it ourselves.
The specials I have no clue, don't really care about those anyway.
Estimated release date? Nope. As SkummDude said a few posts above: "As for radio silence? Fine here's what's going on, the Project Manager is currently proofreading everything and will pass it back to Blue once he is satisfied that everything is properly in place, and there's nothing game breakingly wrong. There is not gonna be any progress updates to how far along this process is. You'll just have to wait for it to be done as there is little to say on it until the process is finished. Is that enough of a look inside to help tide you guys over?", which, according to them (Skumm) is public information available on Discord. I did not verify this claim for I am no fact checker or (halfway decent) journalist.