Yeah, they didn't mention the poison, but they'll definitely reveal it was poisoned in the 10th ep. They have to have a scene with Cersei, Qyburn, and the Mountain that screams. Otherwise, why have Qyburn in the first episode of the season and then never show him again? I kinda agree. They essentially ended Sansa's and Theon's arcs this episode, I wouldn't be surprised if they ended Jon's arc next episode, too.