I think the Tigers proved this year they could win with smart baserunning. They didn't necessarily need a big home run hitter. They do have some power potential with Torkelson, Greene and Cameron. The later two also have speed.
The outfield looks pretty set to me. I expect Baddoo, Hill and Grossman out of spring training with Greene and Cameron getting significant time as the season progresses.
An established shortstop would be a big upgrade along with Schoop at second. That should solve the black hole they fielded up the middle.
They improved so much at baserunning. I'd like to see some similar improvements on defense. That probably means less flexibility and more specialization from Hinch. Schoop should play second. Baddoo in left and Grossman in right. Torkelson at first once he makes the team. Let the regulars get very comfortable at their positions. They have other players who can move around.
They probably keep a lot of the same position players next year with a couple upgrades. Shortstop is the obvious area for improvement but the pitching staff could really use some upgrades in the rotation and bullpen.