Its not very well developed yet, but I've run a few short adventures out of this setting with the available pre-release rules compilation and the DDX pregens, and it is slowing growing.
(I really like the idea of Rifton, I may have to adapt that)
Crystal Peak
The Twin Spineback Mountain Range forms the coastal line between forests to the south, and oceans to the north. A large portion of it is dotted with small mining towns, and a trade road connects each of the towns along the mountains. During the Spring, Summer, and Fall seasons, brave, or reckless, trade caravans travel first west to east, and then back west from east, bringing needed supplies to each of the towns along the route. During the Winter season, frightful weather and massive snowfall shuts down the road (the trade caravans who survive the rest of the year spend the winter enjoying themselves and restocking in the warmer foothills to the west). Once Winter comes, each town along the range lights a large pyre somewhere in or very close to the village, maintaining it throughout the winter with stockpiled supplies, and, if necessary, venturing south out down the mountains into the forest for more supplies. The pyres serve as a notification to the adjacent towns that one is still alive, but the light from one town is visible beyond its first neighbors.
The town of Crystal Peak is situated about halfway to the summit of Grey Mountain, one of the smaller mountains in the range. The elevation of Crystal Peak is about 3 miles. The town is populated roughly 40% by dwarves, 40% by humans, and 20% by other races. There are a few small blacksmiths in town, who primarily work on mining equipment, and there are a few taverns, as well as a large town hall. There is a temple to Amaunator, as well as smaller shrines to both Moradin and Bahamut*.
Crystal Peak has no official ruling council, but operates on an unofficial village council style of leadership, where anyone who has something to say may speak, but there are certain elder, and therefore more highly regarded, members of the town, who's ideas often become the decisions made.
Crystal Peak has no standing militia, but it does have a hearty dwarven constable (probably a level 1 or 2 fighter) who tends to keep the peace.
Roughly one mile out of town is the entrance to the Crystal Peak Mine, a crystal mine, large and growing, from which the town takes it's name. Crystal Peak's neighbor to the east is Stonehaven, a mining town which has a similar population, but with a larger dwarven percentage and more balanced "other" percentage. Stonehaven's mines specialize in metallic ores.
*obviously, this could change once the "official" pantheon is released
Here are the postcard summaries of the two adventures run so far:
1- Kobolds in the Mines!
Yesterday's morning shift of miners went to work and never came back. Last night, the evening shift stayed in town and the constable went out to see what happened. He, too, did not return.
-The adventure was similar to the delve in that it was primarily just slaying kobolds.
-The PCs went out and investigated, finding a variety of kobolds who had dug their way into the mine and laid a few traps. In the end they found a kobold wyrmpriest and handful of dragonshields who were devouts of the young black dragon living in the back room.
2- Monstrous Humanoid Warband
Winter has descended and the trade roads are all but useless, unless an uncommon bout of clear (not warm, just not stormy) weather happens through. The past five days have been fairly clear. Three nights ago, the Stonehave pyre was extinguished.
-A Hobgoblin warpriest/caster had put together a band of hobgoblins and gnolls and was campaigning across the mountain range. They destroyed Stonehaven but for one survivor, who just managed to make it to Crystal Peak in time to hear the gnolls howling outside the city. The PCs put up a mighty defense against two gnoll assault waves, and then decided to venture out of the city to the hobgoblins camp, and took him and his men head on.
-The adventure (intentionally) ended in a TPK, but that little historical event will probably be rewritten for future adventures.
3- Ruins of Stonehaven
This is still in the works. I think that someone in town has a friend or loved one who was in Stonehaven, and the PCs will be sent to investigate, to find out if anyone survived. Stonehaven will now be infested with undead, and be "ruled" by a necromancer or two.
-There will probably be a fight or two along the road, then a couple with undead and the spell casters controlling 'em. Haven't yet come up with a motivation for the casters... maybe use the undead as mining slaves? Not a great reason to animate a town though.