Purchased the season pass, completed BoW and the main quest line ... and then deleted all save games with the exception of the final encounter with Eothas.
I *only then* recalled that PoE White Winter was an in-game expansion that had to take place before the end game. Will it be the same for the coming 'Seeker/Slayer/Survivor' and (more importantly to me) 'The Forgotten Sanctum'? Or is there a possibility to continue adventures after completing the main questline?