Well don't forget that the Lore and the world of this game is made way before 2.0 so the whole world map and lore is well known to the team. If you want to build a good RPG you have to set up the world and lore before anything else.
Meracydia is also mentioned in game. We will go there as well later. There are even more continents than the 3 on trailer (which is in fact one big continent but is divided into 3 only because of huge cultural differences much like Eurasia in reality).
Those 2 locations are also under Garlean rule and that cutscene made it clear to us. No I don't think that was a specific reference to SB like OP is meaning but more like a lore statement.