Global Illumination Question

In the most recent update, it seems that Global Illumination has been incorporated into the rendering engine to allow the real-time rendering ability to better approach off-line renderers. So is GI (global illumination) on by default now? I do not see any settings or the ability to enable or disable GI, so kind of confused. Does anyone know about this?

yes GI is implemented and cannot be disabled.
You can choose to display the scene in real time in LOW, MIDDLE or HIGH mode. These resolutions are only for navigation and editing the scene. When D5 renders the quality will be the highest (higher than High).