Edit: Click on the title to see the full post.
Here's a little update for the next couple episodes which, thankfully, have been gifted with a more detailed description on Wikipedia.
Elementary School Musical:
When Krusty the Clown is announced as the recipient of the Nobel Peace Prize, Homer invites Bart to accompany him on a trip to Oslo for the ceremony. Sensing that Lisa will feel left out, Marge surprises her with a week-long retreat at performing arts camp, where she is greeted by her artsy counselors Ethan (Clement) and Kurt (McKenzie) and fellow musically inclined campers (Michele, Monteith and Riley), who inspire her to embrace her creative side. After she returns to Springfield, Lisa becomes restless with her ho-hum suburban lifestyle and sneaks off to Sprooklyn in hopes of connecting with her inner hipster, but she soon realizes that the city is not the same as camp.
Loan-a-Lisa:
When Grampa gives each member of the family a portion of his savings, Lisa and Marge spend their money in drastically different ways.
Lisa invests in Nelson’s brand-new business venture, but soon realizes that her friend’s instant success might lure him away from the classroom. Worried that his judgment might be clouded, Lisa introduces Nelson to the well-educated and successful creator of Facebook, Mark Zuckerberg (guest-voicing as himself), only to find out that he too dropped out of school.
But when the soaring business suddenly takes a sharp turn, Lisa teaches her friend that education is invaluable.
I have also learned that the new Treehouse of Horror (which will appear sometime in October) will have a parody of Twilight. (A.k.a to you people, the book with sparkly vampire faggots.)