I really thought the Cersi/Jamie scene was more about Jamie taking a stand against the manipulation of his sister. Cersi has just TOLD Jamie he would kill Tyrion, he said it would be taken care of in the court, she said No, you (Jamie) will kill him. I am interested to see where this goes since Tyrion has asked to see Jamie, potentially to ask him to speak on Tyrion's behalf at the trial.
Prince Oberon being named as one of the 3 "judges" is also intriguing. IMO, his character doesn't strike me as one that will be manipulated by the Lannisters. If he wants revenge against the Mountain, he'll get it on his own. He doesn't need a deal with Tywin.
Sansa/Littlefinger has emerged has a storyline I wasn't expecting but am interested to see where it goes.