Warren Buffett’s letters to Berkshire Hathaway’s (NYSE: BRK-A) (NYSE: BRK-B) shareholders are among the most anticipated pieces of financial writing every year, and the latest edition will be released tomorrow. While there are some parts of the letter than contain information we already know — such as Berkshire’s track record of performance and a list of its largest stock holdings — here are three things I’m especially curious to read about.