This week the opera world will get a chance to see a world premiere, a rarely performed work, a season-opening and two new productions with distinguished casts. Among the performers this week are Pretty Yende, Irene Theorin, Sonya Yoncheva, and Javier Camarena. Here is a look at what to see. Lohengrin-Vlaanderen Opera, Belgium Zoran Todorovich sings the title role in Wagner’s {…}