http://made2game.com/articles/Features/The-Elder-Scrolls-V-Skyrim/26217/The-Elder-Scrolls-V-Skyrim-hands-on-The-most-realistic-game-environment-ever/
And if you read down a bit, he says this:
"I was fortunate enough to catch a few words with art director Matt Carofano after my time with the game and he revealed that each town had one dedicated artist moulding and shaping it over the course of two years. Two years! That's an amazing commitment from the artist, and from Bethesda, but it pays off in spades."
One artist for each town over the course of two years?! Those towns should just be absolutely brimming to the seams with detail! My hopes have been elevated yet again for Skyrim, I can't wait for its release!