I just hope we'll be exploring more of the Source. Ilsabard is such a large part of the game world that I'd be surprised if we didn't go there at some point, though it need not necessarily be in 6.0. I'd be interested in heading off to Sharlayan and/or seeing more of Hingashi though I'd be lying if I said that Ilsabard wasn't at the top of my list.

I'm tentatively expecting another expansion that splits the focus across different regions - there's still quite a lot of plot points tied to the Hydaelyn and Zodiark story arc after all and that's supposedly coming to a conclusion alongside 6.0, potentially expanding all the way up until 6.3.

Meracydia is a possibility, I suppose. I'm envisioning it as being along the lines of the forgotten continent in FFIX, complete with ancient ruins of civilisations long since lost to the world. Though of course it might end up being completely different.