Duke for Doug! Or the opposite? Never mind facts are that world’s largest retailer Wal-Mart, just changed top leadership, new CEO is company veteran Doug McMillon, 47. The replacement will take place on February 1and previous chief executive and President Mike Duke, 63 will remain with the company as chairman. It’s kind of a surprise that this announcement became public just few days before the start of the holiday shopping season, when Wal-Mart is expecting trouble again, or new CEO was maybe smart move.