I have just completed Wins and Losses and the last PDA entry tells me to visit Hyzani and investigate a strange signal from Ellyon. I've gone back to Hyzani and he has nothing to say and I presume the stange Ellyon signal is to do with Murky Christmas. Can I not find out what happened to Alex or is that tba?
The main storyline campaign has not been completed. Going back to the Ellyon system star should start Murky Christmas but we still don't have a conclusion for the main story.
Murky Christmas is officially a chapter of the story mission - but for now it can be activated without having to play the previous chapters (because it is also kind of a "christmas mission" ). Will be changed for the next major update.
