Watched episode 5 yesterday, the story is progressing so fast, I feel like there's not much left to fill the next five episodes with

I have a question though concerning Margery Tyrell. She has a bigger part in the series as she had in ACoK, is this purely to up the boob factor for the show or does she play a bigger role in the next book?
No spoilers please, I haven't started ASoS, a simple yes or no answer will do!