Playwright Nilo Cruz has had a good week. “Over the weekend, at the Humana Festival of New American Plays in Louisville, Ky., Mr. Cruz, a 42-year-old Cuban-born New Yorker, was awarded $15,000 by the Harold and Mimi Steinberg Charitable Trust for his play ‘Anna in the Tropics,’ which had been anointed by the American Theater Critics Association as the best play of last year not to have been produced in New York City. Then on Monday Cruz won this year’s Drama Pulitzer – in a “rather large surprise in the theater world.”