The US Patent and Trademark Office has released a new application from Apple that describes a lifting mechanism for a MacBook to improve cooling.
There are several schematic drawings. On one MacBook, lifts up on the legs on the sides:
On the second, a massive block emerges from the bottom:
It also describes two ways to lift the laptop: mechanical and manual. Mechanical can be associated with macOS and will activate when the processor temperature is high or when a certain program is launched.
A small gap of a centimeter (conventionally) will help to capture more air for the fans. Also, this will raise the keyboard, and it will be more comfortable to type. Plus, the gap can add power to the speakers. In general, there are many applications.
Whether Apple implements such a mechanism, however, remains a mystery.