Little will serve as a senior advisor. He worked his way through the minor leagues as a manager in the 1980s and 1990s. He was at one point the manager of the Durham Bulls, and he taught the cast of Bull Durham how to look like baseball players. Then Little was a coach at the big-league level for several years before managing in Boston and then Los Angeles. During that time, he was best known for leaving Pedro Martinez in too long against the Yankees in Game 7 of the 2003 ALCS. He's been out of professional baseball since 2007, but has spent the past couple seasons managing at the high school level.
Young will serve as a special assistant. He spent most of his playing career with the Pirates, also spending one season with the Royals. After three years from 1997 through 1999 as one of the Pirates' best hitters, he declined steeply while in the midst of a four-year, $24 million deal, partially the result of knee injuries. I'm not totally sure what he's been up to since then, but for whatever it's worth, Wikipedia says he lives in Arizona and works in youth baseball there.