Update: Doesn’t work anymore. 😛 Some sources said that those who managed to get it might not end up getting the season pass for free after all. So, don’t worry if you were too late to the party. 😛
Whether it’s a glitch or a quiet offer still remains to be seen, but if you own a copy of Fallout 4 on PlayStation 4 and your PSN account region is Europe, you can click here to head over to PlayStation Store and get the Season Pass at absolutely no cost.
There are multiple reports of this working just like any other free title on the PlayStation Store. So if your PSN account is of a European region, rush to the link above and get the Fallout 4 Season Pass for free.
The North American region of PlayStation Store still shows a price tag for the same item, so if yours is a US PSN account like mine, you can only stare in silence.
It’s not clear whether or not the people who are getting their hands on the season pass for free will lose it soon, but seeing that it’s not being done via hacking of any kind, you should be able to keep the season pass.