Yes, from what I understand, all of the WW leaders are people who have actually lost weight with the WW system-and then were trained by WW to become leaders.
The topics every week DO indeed change, the focus is different each week. Last night, our topic was "If hunger is not the problem, then food is not the solution". We talked about eating because we are tired, stressed, bored, angry, sad, because we are out with friends or at a gathering and everyone else is eating-all of the reasons why you might eat when you are not physically hungry.
A couple of weeks ago, the subject was soup-and using it as a tool for weight loss. (Filling, lower calorie, takes a while to eat, etc.) and we talked about premade soups, and we shared some good, easy soup recipes.
So...every week is different.