This year, his 50th at Berkshire’s helm, the world’s third-richest person could write something quite different. When Buffett releases this year’s letter on Saturday, he may point to opportunities outside of the United States, after he recently decided to buy a German motorcycle accessories retailer and said he may shop more in that country. In his letter, eagerly awaited on Wall Street for Buffett’s candid thoughts on investing, business and life, the 84-year-old Buffett may detail his vision for Berkshire in the decades to come, including after he is gone.