Don't know about you, but I got a response some hours after I sent the mail.
They said that the updates should be up within this week and that they actually don't know why Team 17 takes so long to do so. Also they put effort in trying to push updates around the same time with Steam. If we don't get them in time here, it's either on GOG or Team 17, so don't blame the devs.
That's good news. Let's hope that an update will be available soon.