@OptoNick: See above, that poster was linked in this thread. It doesn't confirm it really. What if it was someone's joke? Or simply a mistake? Valve never confirmed it and never commented on it and neither did CDPR. The only answer was from GOG, and it was like I said above. Also, as some report from the latest leaks from CDPR, there was no word about Linux there. So that's not very reassuring.