Los Angeles Times: Sumner Redstone, who turns 92 next week, has largely disappeared from public view. His health is being watched closely because he is the executive chairman and controlling shareholder of both CBS and Viacom. When he dies or is no longer able to oversee his affairs, trustees overseeing a trust will determine what happens to his controlling interest in the two companies. That has led to speculation that both CBS and Viacom could be sold. “What happens to CBS? What happens to Viacom when things change?” asked Mario Gabelli, whose investment firm controls the second-largest bloc of votes in Viacom and CBS. “I don’t know.”