[Number 3]

Based on what we've seen in the 2016 Volt interior and now the 2016 Malibu interior, I think it's safe to speculate the following:

Center stack, including large touch display is common between Volt and Malibu. The center HVAC vents are different in both and stylized.

The steering wheel is common in both the Volt and Malibu. Wheels tend to be common across many models with the difference being trim on the arms or spokes. Horn pad and wheel are generally common.

Still need to see the center stack if you don't get the large MyLink display.