Buffett's Annual Shareholder Letter for Berkshire

Berkshire Hathaway published its annual shareholder report, which includes Buffett's closely watched letter to shareholders. See the letter here.

The biggest thing to come out of the letter: that Buffett has four people in mind to that would be the next successor for managing Berkshire's investments once Warren retires. Thoughts on who will be on the short list of four candidates? Eddie Lampert makes sense? Others?