I, for one, am axiously waiting for the walk of shame. They've already foreshadowed it with the previous high septon. Unlike the books, Cersei won't get caught sleeping with "everyone but Moonboy," but they've set her up with Lancel's character and her role in Robert's death. I don't know why they decided to have Cersei go after Margaery's brother instead of her, but it will work out the same, I guess. However, I think I've said one of my favorite parts of the books is when Cersei suddenly realizes she's screwed and tries to escape, but it looks like they probably won't do the same scene in the show.
As for Sansa, I think it's going to get ugly. I don't think they'll let Ramsay pop her cherry, or perhaps they will but Sansa will get her revenge during the act. But I have a feeling that it will be bloody. She has the option of lighting the candle in her window as per last episode, but not sure what the response will be. Perhaps Brienne will come to her aid. I'm expecting blood and death. Would be interesting if it's fit into the attack by Stannis. But it's anybody's guess at this point, since this storyline is so far removed from the books.