I am pretty sure that Tav will get its own content, like the dream sequences with the "who do you dream of?" character. That said, we don't really know how much it will differ from origins.
I hadn't thought of this - but hopefully the "who do you dream of?" character is Tav specific. That would be nice if not even Dark Urge got that interaction. My assumption was all characters would be able to create this character - but that would be a great way to make Tav unique.
