I'm not sure why is there such a surprise. For a last few weeks there was activity here, even earlier on his patreon page, and anybody is surprised like a winter service about snow in middle of January.
Yeah, I know, creating hype actually doesn't mean that update will be released.
I'm really happy that rumors were right. (this time, for this game) I hope game will have from now on regular updates. And if dev comes here (i don't know if he does), thank you for coming back.