Obsidian Entertainment - Feargus Urquhart Interview @ GameInformer
Gameinformer has a video interview with Feargus Urquhart. Urquhart talks about how South Park Studios directly approached Obsidian instead of going through their publisher.
Next he goes into how he wanted to give the game the 'South Park' look and feel while finding out what Matt and Trey's vision for the game would be. He came to the conclusion that he needed to make the game feel like the player is stepping into South Park. The art will be just like in the show which frees Obsidian up to create more content.
Overall the interview talks about the vision for the game and how Obsidian got handed the job.