"Pretty Little Liars" viewers know that 'A' will be revealed, but the real question is when the mysterious character will finally be uncovered.

During the Halloween special of "Pretty Little Liars" for its fans, there were nothing much unraveled on the identity of 'A' and when exactly the character's face will be shown. However, PLL showrunner I. Marlene King said, "I think fans got a little worried when they found out we were going seven seasons because they thought maybe they're going to have to wait that long to find out who 'A' is, but I am promising you that you don't. The identity of big 'A' is going to be revealed before Season 7 starts."

"Before Season 7" could mean the Season 5B or the Season 6. Perhaps, PLL fans could also expect big changes on the lives of the Liars after the revelation of the mysterious 'A', like what executive producer Oliver Goldstick said, "There is an endgame; there is an 'A'. There is a future for these girls beyond Rosewood. There is life after high school. There's still more to be explored."

For the Season 5B premiere, here's the official synopsis from ABC Family:

"Christmas is quickly approaching, and all of Rosewood is full of merriment except for Aria, Emily, Hanna, and Spencer, who aren't feeling much holiday cheer after the loss of Mona and Spencer's murder charge looming over them. But when an opportunity presents itself with the chance to get evidence to clear Spencer's name, the girls and their partners devise a plan to get justice for Mona and finally bring Alison down. If the plan is successful, it could be a very Merry Christmas after all.

Meanwhile, Alison gets a glimpse at the past, present, and future by a ghostly presence."

ABC Family's "Pretty Little Liars" starring Troian Bellisario, Shay Mitchell, Ashley Benson, and Lucy Hale will return on December 9.