Here's what Entertainment Weekly's Michael Ausiello reports about the two actresses with Down syndrome:
Question: As the mother of an absolutely beautiful and wonderful daughter with Down syndrome, I was thrilled to see the characters of Becky and Sue’s sister in Glee’s “Wheels” episode. Any chance these characters will be back? —Cathy
Ausiello: “I hear that that will happen, yes,” confirms Jane Lynch of her TV sis’ return. “I haven’t read anything yet, but I heard that’s in the works for somewhere in the next nine episodes.”