It's on Disney Channel on Demand, which I have because of my sister, and I just watched it. Here are some quick notes I jotted down.
Opening- They're talking about how they all want to be in a sketch with the guest star.One of the minor cast members on the show comes in, asks who they're talking about. They say it's someone bigger than Lagy Gaga, smaller than Oprah, and pinker than Simon Cowell. It's revealed to be Miss Piggy, who says that she's bigger than Oprah, less pink than Simon Cowell, and will pick the sketch she wants to be in.
Main Plot- 90% of the show is taken up by a backstage plot where all the cast members go into Miss Piggy's dressing room and ask her to be in their sketch. Most she kicks out, one she Karate chops, and once she throws a tantrum, since the person asking at the time plays a character called Tantrum Girl. She also talks to Kermit on the phone once, poking fun at how So Random is now it's own show, which, unfortunately, is one of only two references to the other Muppets. Eventually one of the Cast Members calls her a Princess, and she likes that as a sketch idea.
Only Miss Piggy Sketch- The sketch is a spoof of the "Real Housewives" shows, called Real Princesses of New Jersey. Miss Piggy plays Rapunzel in the sketch, which is okay, but not that funny.
Closing- The cast thanks Piggy, who says it's an honor for them to work with her, and calls Kermit and tells him to bring the car around, and keep the engine running. She runs out, and the show ends.
All in all, it's okay, and kids will find it hilarious. It will do exactly what it was meant to do, which is raise kid's excitement for the Muppets.