Storyline 360 and Storyline 3 let you change the orientation of an object as it travels along a non-linear motion path so it's always facing the direction it's moving.
And it's really easy to do. After adding a motion path animation to an object (any motion path except a straight line), go to the Animations tab on the Storyline ribbon, click Path Options, and choose Orient Shape to Path. That's it! Now your object will change directions as it moves along your motion path.