Young spent all of last year with the Dodgers as a 4th outfielder and batted .246 in 126 AB. His career numbers in the majors are .267/.330/.394. He was ranked by Baseball America as the #9 prospect in the Dodgers system in 2008. He has crushed the ball throughout the minors and his numbers there are great.
Hopefully the guys the Bucs will ultimately give up aren't much. If that's the case, then this is a steal for the Pirates as it gives them someone who has shown in the minors he's capable of putting up some decent number. Perhaps he can get it all together at the ML level.
Most likely, OF Craig Monroe will get DFA'd or released due to this trade in order to make room for Young on the 40-man roster. I am totally fine with that if it were to happen because Young > Monroe.
I'll update this post as more info comes in.