As you might know, the upcoming Ubuntu 16.04 release will be an LTS (Long-Term Supported) one, so it will still ship with the stable and reliable Unity 7 user interface as the default desktop environment. Unity 8 will be available as well, but as an alternative, experimental session. Having an option that changes the Unity launcher from the left of the screen to the bottom, it has to be one of the most requested features by users since the day Ubuntu introduced the Unity interface.