SPOILER ALERT FOR GAME OF THRONES SEASON 6 EPISODE 8
In the latest episode of 'Game of Thrones' we see Cersei, instead of going with the faith militant, telling them that she chooses violence. After that the re-animated Mountain brutally kills one of the faith militant.
In a following scene we see King Tommen ban Trials by Combat. This of course cancels the fan theory that The Mountain and The Hound would face each other in Cersei's Trial by combat.
Qyburn and Wildfire
After King Tommen bans trials by combat Cersei and Maester Qyburn have a talk in which Cersei mentions a rumor she told Qyburn about. It's been theorized that this rumor concerns the wildfire that's stored in the castle.
You might say that Tyrion used it all on Stannis' ships during the Battle of Blackwater Bay. But there was a whole lot of wildfire and Tyrion could not have used it all. The wildfre hidden in the castle could potentially take out all of King's Landing.
In episode 6 we saw a vision through Bran which included Wildfire burning in a hallway. Cersei might be planning on burning King's Landing down. Her saying "I choose violence" might not just be a act of defiance against the faith militant, but it might also mean that Cersei is no longer willing to compromise and is willing to do whatever it takes to win. Including burning King's Landing down.