Lets do some algorithms.
If fortuna would have released on this weekend, you may have a bug/glitch issue. That means, you have to correct it. It leads make your customers/players to restart the game. That will be waste of time. Killing the hype and mood.
So, it won't be releasing on Friday, Saturday and Sunday. I believe these days are prime days.
Releasing it on Monday ( today ish ) is not possible because of server maintanence ish.
However, releasing on tuesday, wednesday or thursday is more likely. Players who will play in these days, will see the glitches, report 'em. Devs will try to fix them. In this way, It will be ready to weekend prime playtime without major issue.
Hardcore players would have already experience of it. They(i) can make guide videos about it. This will make everyone's happy and succesful publish.