We're finally getting into the lore deep. The break week will be brutal and I hope we don't get too blue balled.
I don't think we'll get the name of the Ancient Kingdom but I'm hoping we at least find out more about the threat of the world sinking. Vegapunk predicted the sea rising by one meter and says that it wouldn't be completely natural, but it also seems like using the Mother Flame wasn't the only cause of the rise. Maybe it triggers something that is naturally occurring? I just don't know how Vegapunk would know Imu was going to use it and when.