Whizbang Dustyboots
Gnometown Hero
Thunder Rift would also be the right size for a detailed look, but it obviously has a lot less nostalgia glow about it than Nentir Vale does.The new DMG is supposed to have a setting, but I imagine it will be something smaller and basic. Nentir Vale is the perfect one to include.
Still, the World of Greyhawk seems to be the way to bet right now, based on hints here and there by WotC freelancers.