Last year was full of literary riches, with remarkable offerings on both the fiction and the nonfiction fronts. And it seemed like books really had people talking, from Ta-Nahesi Coates’ powerful memoir, “Between the World and Me,” to Hanya Yanagihara’s absorbing novel, “A Little Life.” But time waits for no reader, and 2016 promises new page-turners and new conversations. Here are 15 books publishing in the months to come — expect to hear more about them.