-I had a theory that Fjorn could be Sharena's mother (who she writes letters to). It lasted less than 2 minutes, because she is called a Princess, not a Queen.
-If Veronica's still there, that means the blood problem will not be solved.
-Zach doesn't appear in the trailer. It would be normal for Anna since she's been in (all?) games, but for him... Maybe FEH angst is coming.
-There's a woman who looks like Rinkah and Severa/Selena at the same time. This one will most probably be an ally, or the first defeated foe.
-There's a mature woman with a sleepy look.
-There's a Ganondorf/KingGaron-like villain.
-Everyone's wearing Askr-Emblia clothes.
-I hope we get a 3rd book, I wouldn't want a typical ending like "oh, we have to part ways".
-That will most probably happen. Why don't we dream about customizing our summoner then?
-Virion will not be in the main team anymore then? Wow...