On the field Hill is best known for his defense and his speed. Both could eventually be plus-plus for him. His speed allows him to be a threat on the base paths and also helps him take extra bases. With his speed it helps him on the defensive side. It allows him to get to a lot more balls on either side of him. He also gets a pretty good read off of the bat to track down fly balls. His arm isn't bad but does need some work on his mechanics. Being only 19 he has the time to improve his mechanics. He has the the ability to be a potential gold glove winner.
With the bat he has shown he can drive the ball to all fields with gap power. As he ages he will add more power to the bat. He still doesn't project as a power guy, but someone who can give you 12-15 home runs a year. His downside is from him expanding the strike zone and not being able to recognize pitches..
In his first year in professional baseball Hill struggled in the rookie league and low A ball. He hit .208/.296./.295 in 47 games. He did have two home runs and 11 stolen bases in 13 attempts. His walks weren't bad with having 18, but he did strikeout 45 times. He was shutdown due to a back injury also last year.
Derek Hill has a long ways to go before he makes the majors. I believe his ETA is not until 2019 at the earliest. He could eventually be a gold glove winning centerfielder who is also a lead off guy for the Tigers. Only time will time will tell with someone as young as Hill.