This was posted on reddit recently:
This will probably eventually get deleted because it is too risky for me to identify my connection to the show. However, for those who care I have some spoilers.
In 7x10, it is revealed that Spencer is adopted. It is left as a mystery whether she is Mary's other baby until later in 7B when it is revealed that she is not.
7x10 reveals that Alison is pregnant. Dr. Rollins is the baby's father.
Noel dies in 7x10 and it is indeed spectacular as Marlene promises.
Spencer is shot by Jenna in 7x10 but we do not find out that she survives until 7x11.
Sydney will be a red herring in 7B.
Melissa killed Charlotte with her suitcase handle as the Liars previously suspected. Her motive is a combination of revenge on Cece and protection for Spencer.
Uber A is Paige. She is Mary Drake's second child and she is trying to avenge her sister, Charlotte. Paige has been involved all along and she was the real redcoat and the one who really stole the game from Mona. Marlene lied a lot in her interview after 6x10 and Paige really killed Ian, Garrett, and Wilden although her motives for those deaths are not explained in 7x20.
DISCUSS!