Past winners are:
2010: Mike Trout
2011: Julio Teheran
2012: Jurickson Profar
The winner in 2013 is...Byron Buxton.
The First time I saw Buxton was at the Under Armour All America Game..
I questioned his ability to hit at that point. I saw a lot of movement I wasn't sure would translate. Power was ok but not impressive but the speed, athleticism and quality defense in CF was clear.
When I see Buxton swing now, it looks like a different guy. It's amazing how far he has come in such a short time. There is a reason that many are throwing his name out with the greatest players in baseball.
I won't compare him to Mike Trout like many are. A comp I haven't heard, and the position isn't the same, but Paul Molitor could be a statistical comp for the type of career Buxton may have. Both have smooth swings that create solid but not spectacular power. Elite hitter, plus speed, impact player all around.