Here are some officially confirmed spoilers for season 4B of PrettyLittle Liars which airs on January 2014:
~ We will definitely find out if Alison is dead of alive in the Halloween episode
~ We'll find out meer about Ezra's motives and whether of not he's Big -A in season 4B
~ We can expect some Ezra flashbacks
~ At least one person knows about Ezra and we will find out who in 4B
~ One of the liars will start to suspect Ezra early on in 4B, but will be very careful because of Aria
~ Maggie will be in season 4B
~ We will find out meer about Mrs. DiLaurentis
~ Mike and Andrew will be in 4B.