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In a recent interview withTVLine, PLL executive producer Oliver Goldstick dished that there is definitely at least one more member of the "A" team beyond Mona (Janel Parrish) and Toby (Keegan Allen), though he doesn't say if that third person is the one ultimately in charge, or if there's someone else who is even more powerful.
He did say that the writers know exactly who "A" number three is, and fans "know this person." Exciting!
For those of you who are wondering, showrunner Marlene King told TV Guide that the writers didn't always know Toby would be part of the "A" team — "until early on when we decided to not kill him, as in the books."
Hopefully the third "A" will be just as shocking as Toby, if that's even possible.
For much more from Oliver, read the whole interview atTVLine.