With the innovative Peter Gelb at the helm of the Metropolitan Opera, and the controversial Gerard Mortier preparing to take over City Opera, New York opera fans are in for a lot of changes, and a lot of envelope-pushing. “Because the singers at the Met are booked much further in advance than those at the City Opera, Messrs. Gelb and Mortier will each present the first season he has fully designed in 2009-2010.”