“Wheeldon has taken an enormous risk, abandoning the comfortable role of resident choreographer at City Ballet for a venture with unknown prospects. At the same time, in a world of relatively few big-name ballet choreographers, Mr. Wheeldon’s announcement has prompted comparisons with giants in the field — like George Balanchine, the co-founder of City Ballet with Lincoln Kirstein, or Serge Diaghilev, the impresario behind the legendary Ballets Russes.”