Well, if you're going this summer then all that Frozen stuff is new, but limited time. There's a couple of shows, an ice rink and special fireworks. Other than that, I can't recall much at HS being updated recently.
No the attraction is different. Same sims different movies that are segmented and combined randomly.
It's just a joke in the Star Wars community the adventure continues seems to imply a sequel. But its a prequal attraction (mostly). Kinda like the Star Wars saga in general.