When we wrote the 4th Edition Forgotten Realms Campaign Guide (releasing this month), we generated so much material that not all of it fit between the covers.
The most significant such area is a region of Returned Abeir called Gontal. In the FRCG, Gontal is described as so: "The western land of Gontal hunkers behind its mountainous border and reveals little of itself to outsiders. A land of mystery to many Abeirans, Gontal’s citizens know it as a place of raging intrigues."
Interesting, yes. But a hook that waits for a follow-up.
So here's the follow-up, and a prime example of how DDi will enhance and extend D&D. Even as the FRCG is published in hard copy, you can download a digital copy of the 2 page Gontal spread here. Actually, I think most of you can download the Gontal region even before you'll have a chance to buy the FRCG (not to mention the copious previews the DDi team has assembled for the FRCG; seems like there's a new extract from FRCG going up online every day).