Zardnaar
Legend
Actually, Sword of Air, Stoneheart Valley, and Bard's Gate (NG version) were purchased by my party as a gift to me, in the hope that I'd run it for them; turns out it's pretty awesome, so I'm converting it over to 5e. I got lucky with the timing for the new Bard's Gate, since my insurance money started coming in finally (long story).
EDIT: Oh, I've heard that before the end of the year we'll get two of the "Environment" books, Mountains of Madness and one other...can't remember, swamps? Mountains of Madness should have a lot of info on Erod Flan and Tyr Whin, and I'm hoping more on Aka Bakar and dwarves in general, and maybe the dwarven pantheon.
Part of the theme of Lost Lands, I should mention for anyone really looking to get into it, is that your players are meant to discover the deeper mysteries hiding behind the face they're provided; it's a very common theme throughout all of the new FGG books and adventures, as well as the majority of the NG products that I've managed to get a peak at.
I'm not that familiar with the LL world just the snippets I picked up out of the QoD books.