Details are here.
This is the reason they hired him: "The Cubs are counting on him to get the most out of young players such as shortstop Starlin Castro and first baseman Anthony Rizzo, along with prospects such as Javier Baez, Jorge Soler, Albert Almora and Kris Bryant."
If he can do that, it's a good hire. If he can't...well, that makes him just like every other manager the Cubs have hired in my lifetime.
