Warren Buffett pens last letter as Abel prepares to take over

1. Warren Buffett announces Greg Abel as his successor at Berkshire Hathaway. 2. Buffett will no longer write annual reports or speak at shareholder meetings. 3. He plans to accelerate share sales for charitable donations, not due to negative views. 4. Buffett expresses confidence in Abel's capabilities and leadership potential. 5. He believes Berkshire has better-than-average prospects despite his retirement.