Roethlisberger attributes their week 1 loss to the Patriots to headset issues which caused a failure in communication between the coaches and the himself. A league spokesman said that the interference was due to inclement weather and had nothing to do with the actions of any individual.
But Roethlisberger clearly isn't sure. He doesn't directly accuse anyone of anything in particular, but he did say, "Whether we were outcoached or outplayed or they had some kind of a leg up, I always felt that they knew some of our offensive plays. For whatever reason. Maybe it was better scouting or whatever. But I had always felt that."
With the spying issue a few years ago, and 'deflategate' still hot, it is clear that Roethlisberger is implying foul play without actually saying. I would say, based on Pat history there someone may need to look into it but with how the NFL has handled cheating before, I don't think anything will come of it.