Warren Buffett says that lately he’s been pondering the future of Berkshire Hathaway Inc. more than usual.

Like in years past, he has been busy composing his annual letter to shareholders reviewing Berkshire’s performance in 2014. However, because 2015 will mark the golden anniversary of Berkshire Hathaway under “current management,” Mr. Buffett has also been laying out, on paper, his vision for Berkshire for the next 50 years.