Playwright Tony Kushner is 47 and “heading into the most seismically charged week of his career: his latest work, the semi-autobiographical musical “Caroline, or Change,” opens at the Public Theater today; the first half of Mike Nichols’s six-hour, star-filled, $60 million adaptation of Mr. Kushner’s epic “Angels in America” has its premiere on HBO next Sunday. “Angels” will be broadcast and rebroadcast to more than 30 million homes, and the number of people who see it the very first night should easily outnumber those who have seen the play in the several hundred North American stage productions since it opened on Broadway 10 years ago.”