Then there is this comment confirming it is for 1-5 players.
And this one is semi-disappointing, but was obvious. In #chatter, "Today" is 2nd of September.
Also adding this from the 10th also from #chatter:
(In #chatter on Mateusz' server. Some responses from other people edited out.)
No, but seriously, there is a bunch of info in here. 36 special cards and card game release info.
Also, we already knew this about the cardgame, buuuut, I will post this here anyway...
And about the fact Mateusz is going to do Inktober:
Which had mostly already been said on the Discord in #chatter:
And more importantly, the sketchbook he will put Inktober sketches in. It has a picture of Blaki drawn on 24th of August 2018 in Portugal or Malmö on it.
From the teaser: date: 25 Aug 2019
From the announcement: date: 26 Aug 2019
"Tak!!! Co roku robię maraton Submachine, podziwiam grafikę, klimat i pomysł <3,a gry karciane uwielbiam. To będzie mój must have! Karty będą plastikowe czy papierowe?"
"Yes!!! Every year I do the Submachine marathon, I admire graphics, atmosphere and idea <3, and I love card games. This will be my must have! Will the cards be plastic or paper?"
"@mill.s.art papierowe, w metalowym pudełku. przynajmniej tak to widzę na dzien dzisiejszy."
"@ mill.s.art paper, in a metal box. at least that's how I see it today."
Same as above:
"Można w to grać samemu czy trzeba z kimś? Super pomysł btw "
"Can you play it yourself or do you need someone? Great idea btw "
"@agataas95 testowalismy od 2 do 4 osob."
"@ agataas95 we tested from 2 to 4 people."
"@mateusz_skutnik ok, nadal jestem chętna, najwyżej sobie wymyślę jakiś przyjaciół"
"@mateusz_ Skutnik ok, I'm still willing, I will think of some friends at most"
Same as above, date 27 Aug 2019: Note that the other person is Karol Konwerski
"Bosze przecież Ty nie nosisz planszowek"
"Because you're not wearing board games" (Google translate clearly did not get it.)
"@karolkonw karcianki to wyjątek."
"@karolkonw card games are an exception."
From the happy Mateusz thing: 31 Aug 2019
Same: 1 Sep 2019
And no particular messages from the last one.
AND FINALLY: The Inktober teaser image from the 15th of September 2019:
EDIT: Forgot the link.