Microsoft will start bundling drivers with Windows Store games to improve the performance of the game once downloaded. This will work by the game download trigging Windows Update to acquire the minimum driver requirements to make sure that application works as intended.
It might not affect many gamers who often keep their drivers up-to-date, but it might help those who forget.
It will put the fear of god to those who like having complete control over the driver updates for their hardware, as this auto-download mechanism will overwrite the existing installation of the driver.
Vole will allow you to roll back the update and Microsoft might provide a way to stop the auto-download of the driver via the Windows Store when this feature arrives.