Comicscontinuum has posted the following two promo cards for this week's "Bart vs Lisa vs the Third Grade" and next week's "Large Marge". The LM one is, needless to say, shocking. Plus, Sideshow Bob is there? I doubt he actually shows up in the episode, but still, weird. Plus, I can't imagine Marge showing off her rack like that. Hopefully this is all for promo's sake.
DABF20 Bart vs. Lisa vs. The Third Grade http://www.comicscontinuum.com/stories/0211/11/simpsons1.jpg
DABF18 Large Marge