I've recently played 3-14: Wonders in the Weave—Part II: Snakes in the Fold and it has a little relation with the Desmirne Arc. It's just a mention to his brother
I'm gonna miss faction missions. Although as a GM they means extra work, specially season 3 and 4 where trere were 10 factions,and some times they made my sessions run slower.
I relly have lot of fun playing them. They give lot of flavor to the game and break the linear sequence of society's scenarios.
I remember one scenario where two players need to contact the same guy. They both go secretly by night and hear the other making noise. After the game, we all had lo of laughs when they realize who was making that noise.
I will look forward how this will work. I have just played a season 5 scenario but it's too soon to evaluate new system.