The producers of the aforementioned Android controllers will rely on developers using their free software development kits to include controller support for their games.
Both companies are making software development kits available online, where developers can download the codes necessary to make their new or existing apps work in the car, not just on a smartphone.
The almost assured success of the Leap Motion can be seen from the tremendous number of developers who have lined up for SDK kits because they see whole new vistas of possibilities for user interaction and the applications that make use of them.