SPOILERS FOR GLEE BELOW AND IN THE SOURCED ARTICLE.
[...]It all leads to Sue joining New Directions in an upcoming episode where she'll partake in a dance number set to a My Chemical Romance song. Whether that means she's joined the club for honest reasons remains to be seen. "Sometimes she's sincere and sometimes she's not," Lynch says. "She's like Glenn Close in Damages. You never know where she's coming from."
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Frank's Response]
This will be the Super Bowl episode Or probably not, teaches me to pay attention to articles. There is no word on which song it is, so far the most popular guesses I've seen are 'Sing' and 'Teenagers'. Feel free to speculate (ON MCR ON GLEE, PLEASE. NOT JUST GLEE) in the comments!