Found this great interview of Joel McHale on the Howard Stern Show. I'd say the first third of the interview is mostly about The Soup, but they do get into discussion of Community eventually, namely, Chevy.
Joel goes into detail about Chevy's time on the show including the n-word incident, and Chevy in general. Howard and Chevy always had a contentious relationship (which Howard says has been repaired), and he is fascinated by Chevy's weirdness. They also get into a small discussion about Dan Harmon but nothing new is revealed.
Joel is a funny guy and Howard is a great interviewer.