Buffett talked about U.S. trade, the stock market and his own future at Berkshire Hathaway's annual shareholder meeting. Here are the highlights.

When Greg Abel becomes Berkshire Hathaway's new CEO next year he will of course take on additional responsibilities, but with Warren Buffett remaining as chairman, the surprise change announced at the annual meeting over the weekend is in some ways just another milestone in the company's succession plans.

"You're losing one of the most esteemed investors one could argue of all time," a source said of investors' reaction to Buffett's plan to step down.