Did Jonathan Pryce Just Drop a Big 'Game of Thrones' Spoiler?

Heads up for all you diehard Game of Thrones fans: you might want stop reading. 

But for those people who crave juicy spoilers, Jonathan Pryce recently unveiled some major keys. The actor, who plays the High Sparrow in the HBO series, stated in a new Polish interview (translated via ONTD):

"When Cersei's trial happens...High Sparrow and everyone else is waiting in the Sept of Baelor for Cersei to show up. And the High Sparrow is very certain for Cersei to show up and so is everyone else. No one expects that something very unpleasant is about to happen."

He also added:

"[P]eople are speculating that this scene will be like the Red Wedding. The doors to the Sept of Baelor will be locked and while everyone is waiting for Cersei, Qyburn will blow the entire place up with wildfire."