ADVENTURERS!: Level 1: World of Imbalance - ORDER NOW

There's an entire section devoted to AFH, you really didn't need to revive a 6-month dead thread just to ask that.
To answer your question, since it's already here, that depends entirely on how well the first ADV! book sold I'd bet. Since there was never a second book - and considering the aforementioned mortality of this particular thread, I'm guessing the first book sales didn't warrant a second book. Which also means there likely won't be an AFH book anytime soon.
Then again, this is all pure speculation on my part, anyone with better info please correct me.