Theres not too many major surprises this time since we have all had the chance to pour over the majority of content but 3 things stood out to me.
1. Nashu returns without Hildebrand? Perhaps she is looking for him and he crashed down on a certain islet with two unlikely companions waiting for him?
2. The first shot of the sub-trailer for the Return to Ivalice Raid was some sort of claw holding onto a white soulstone looking crystal. I doubt its going to be anything related to the Sun-Cryst from later Ivalice Alliance games but it would be neat if its not just part of the Tactics Lore but also teasing another job. The Geomancer in the Astrologian already has people thirsty for another job from XI returning in the future.
3. It looks like the Summons from FFXII maybe be showing up with the exact same effects that they had at the time. In XII they were either protecting things connected to the Dynast King or lurking in areas rich with a raw Aether called 'Mist' that were patrolled by strong monsters usually filled with ruins as the indigenous people had to up sticks and abandon it because of the mist intensifying over time.
Considering the relations to XII and how XIV's devs have always skirted around Ivalices Connection to Eorzea its going to be interesting if this is just Eorzea side Alt universe or a Deep Dungeon style 'through a Thinny' alt world jaunt. The final Boss of D.D's Floor 100 suggested some weird beyond the grave shenanigans going on in Ivalice so time will tell.