I know a lot of people have already predicted it but i think Sharlayan will almost assuredly be the big city and in the trailer. This is the end of the Hydalyn/Zodiark storyline and it would not feel the conclusion without going there. I also think we will get the final job reveal. I am also hoping that the rest of the clouds over Islabard are removed showing a complete map of the 3 continents, and that we at least get 2 more zones there. Also i really want them to show off more hairstyles for Viera. I heard some people suggest Nerva might be in it and going back and looking at the first trailer, it showed an airship in the capitol going down in flames as if there was a big conflict there, perhaps it was an effort by him and his forces to take down the big tower enslaving the citizens and it was shot down by a defense mechanisms. also maybe we actually see Hydalyn or Zodairk.