From what I've gleaned from some LDS members on these threads; the teaching will come back around again in a few years, so you'll not be really missing anything.
There are prepared lessons to guide the teachers, and those recycle, but each time they are presented differently, as the teacher finds things that seem important to them to present. They have a skeleton lesson to work from, but very few follow it exclusively and exactly. There are also talks given by members who have been asked to speak, and by visitors from other wards, or from the stake. This past week, our new mission president and his wife spoke, as did the daughter of one of my friends. Interesting and uplifting talks all, and not something that will be repeated. Fourth Sunday lessons are often on topics of interest to the 1st Presidency, as well. Our bishop did this one, on Morality. Lots of audience participation, and a very good lesson. We will get much of that material again and again, but in different forms, and it very much bears repeating.
Much of our ward is active or retired military, so we have quite a lot to say on morality, from both experience and observation. Makes for interesting lessons. Quite frankly, I've very rarely been bored at our church services.