The road less travelled...

I was just reading an interview with RTD and DT about the final eps and found this:

“Jacqueline King. who plays Donna’s mum Sylvia and The Master’s wife – she’s back."

So, an error of punctuation or a pointed hint? How would it go with Sylvia as the Master's wife? Who would go mad first (ignoring the Master's existing madness)?

Just a thought...