You're right, there is a lot of content outside of the game. It is like an experiment. I have a feeling the large delay for the continuation to the story is either due to writing themselves in to a hole not knowing where to take the story (for longevity more so than anything) or the developers getting tired or bored with the game. Or both!I can't belivebe they don't create the best game of the style, the concept art are incredibles they can do 5 update with this. It's sad.
This is all just an assumption and like most of you, I'm setting my expectations low to avoid disappointment. But will be pleasantly surprised should it be a big update. We will see.