There are a few areas that are mentioned that just aren't released yet. It's assumed they'll be released when the level cap rises, since they are likely very high level areas. There's a vast desert place, with rolling sandy dunes and such you can see right outside uldah, behind it. This is one such area that is already designed, but you just cant get there yet.
So, yes, I think they will be adding all those areas they reference eventually.
Well it wasn't really a question but more like a suggestion that if they mention places and areas that they allow us to see them for ourselves i put as example FFXI how many years has it been and we can't explore the original tavnazia or Mithra's homeland so i'm suggesting and asking for them to not do that again in FF14