Well the secret's out now.
They needed it to film a scene for Glee. Rachel Berry will be offered the leads in both Funny Girl and Anything Goes and she has a major decision to make regarding which role she will take.
Rachel and Kurt will sing "Friendship" as their audition piece, but then Kurt will get huffy because Rachel is offered Reno and Kurt is only offered a swing/assistant stage manager job. But don't expect "Friendship" to be as funny as when Lucy and Ethel ripped each other's dresses off. Rachel will use that nasal voice and eye roll that Barbra uses when she does comedy and Kurt will just use his clown grin and boy soprano voice and expect to get the part because he's gay and fabulous. Then he'll go sing a song with the Adam's Apples and feel better.
See this stuff really does write itself!
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.