Michael K. Williams from Boardwalk Empire and The Wire is joining the cast as the study group's new Biology teacher. I'm really excited to see what he can do in a comedic role, normally he plays the thug or the street hood. His character in Boardwalk Empire, Chalky White, plays a very interesting role in the 1920's booze trade. I'm pretty sure he's going to knock it out the park.
I think the best bit of casting news so far is John Goodman is joining the cast as the new Vice Dean, and adversary for Dean Pelton. John Goodman joins the ranks of big name guest stars who've appeared on the show, like Betty White, Jack Black, Owen Wilson, Lee Majors, Anthony Michael Hall, and Josh Holloway from Lost. Take a look at the first look NBC has released for the new season.