I'd have to admit that I was mildly disappointed to see the Scions in the trailer. I actually preferred the way things were in 6.x, where they were making - for lack of a better term - cameo appearances to help us solve a problem within their individual areas of expertise.

And with that in mind, I don't really understand why they're following/accompanying (not clear on which) the Warrior of Light to the New World. I mean, my personal hope for how things would've played out for them:
- The Twins: Remain in Garlemald offerring support. The situation there really didn't seem overly stable.
- Y'Waifu: Assuming a method of travelling to the First is established, I'd have preferred her to decide to remain there with the Night's Blessed
- Estinien: Remain to support Vrtra and (assuming she survives 6.5) Azdaja, considering what they'll have been through
- G'raha: Difficult one, due to the promise made to him - although we did take him along to the realm of the gods, therefore arguable that we didn't keep our promise
Difficult to comment on Thancred and Urianger as they didn't really seem to have a great deal of direction at the end of 6.0 anyway

Point is, in all of these cases it isn't clear why they've all decided to develop an 'Adventurer complex' (not something they really demonstrated before) and decided to go running off to the New World, abandoning what they were doing beforehand. Whilst the story may (or may not) provide a motive for them to do so, it does feel a bit much.

Anyway, whilst I don't particuarly want to see any of them die as such (as not a fan of killing characters for the sake of it), I do feel that they didn't need to remain front-and-centre and I do hope that their presence doesn't mean we lose the opportunity of meeting more diverse characters to accompany 'us' in the New World.