Actually, Forgotten Realms Adventures is one of the few sources of info regarding the Sword Coast, or at least regarding its towns and cities (not so much the land in between). One of my FR pet peeves has traditionally been that one of most D&D-ish areas is one of the least described ones.It isn't that different from when they updated FR to 2nd edition with the Adventures book. That one basically ignored the Sword Coast and concentrated on Cormyr, the Dalelands and the Moonsea. Of course that book was followed by a lot of supplements detailing the rest of the realms, while I wouldn't bet on much else than the Sword Coast book being released this time around.