In case you've missed it somehow, you've already visited the Ciedalaes at least once — Hullbreaker Isle is part of the archipelago.
And in the last quest of the level 60 ninja storyline,
you also travelled to an island in the Ciedalaes to rescue Yuki from the Truehounds.
There were also seasonal events back in Ver1.0 that took players to other islands in the archipelago.
But, of course, I know what you're really looking for is the chance to explore actual areas rather than one-off instances. It'll be nice for sure, but all things in good time. There may or may not be plans to add such areas in future expansions, but even if there are, S-E would not be able to talk about them right now.