It's been confirmed recently that Matt Lucas (Little Britain, Tim Burton's Alice in Wonderland) is set to play a new character on Glee - a teacher at (McKinley High, I'm guessing?) who's secretly obsessed with musicals. Keyword is "secretly":
The funnyman will show off his song and dance skills as a high school teacher with a hidden love for Broadway, with plans for him to perform a solo track on the series.
Personally, I can't wait to see that. As long as he doesn't go all April on us.
Source: WENN Blog