Here's what to expect in Warren Buffett's annual letter to shareholders (BRKA, BRKB)

Thomson Reuters Warren Buffett, widely considered one of the world's best investors, is likely to tout the merits of passive investing this weekend to readers of his annual letter to Berkshire Hathaway Inc. shareholders. The letter, slated for release around 8 a.m. EST on Saturday, will probably focus on familiar themes for the 86-year-old Buffett, with many single-spaced pages reviewing Berkshire's businesses and managers, Wall Street, the economy and perhaps even politics. "The letters are wri...