IMO, he needs to get better on the basepaths. he needs to take the extra base his speed should allow him to take. I'm talking about situations where he's on 1st and can't seem to get to 3rd on an OF single to RF or when he's on 1st and can't score on a double to the wall. He's playing well, but he's a young kid who still has some things he really needs to work on.
He also needs to walk more. Look at his BA and then his OBP. His OBP is about where it needs to be right now (or higher) for a guy like who has no power. Thing is, his BA is very likely well above where his BA will normally hover. If we give him the benefit of the doubt and say he'll be a .290-.300 batter, with his OBP only being 22 points higher, now it's a problem....cause he's not getting on base near enough.
Of course, he's young and will hopefully get even better, but these are things worth watching.
Again, IMO.