My speculations is 90% done, what a see for past updates of this game, 90% or even more, i think he's doing his best to be perfect. So don't worry
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Judging by his Trello(if it's accurate) it's probably closer to 30-40% just by eyeballing it. Given that it's been over five years since the last major update and over two since Christmas it does not bode well for anything soon. I'm still not expecting anything before the end of the decade if he does not get burnt out before then.