https://techcrunch.com/2019/05/24/macbook-pro-teardown-reveals-subtle-changes-to-keyboard-mechanism/

The shift to a new butterfly keyboard mechanism is Apple’s least popular design decision in recent memory. After a flood of negative feedback over stuck and malfunctioning keys, the company, has continued to upgrade the technology with subtle fixes.

Just two days ago Apple issued yet another update — one it believes will address many of the system’s on-going woes. Today iFixit broke open the new model, identifying some of the changes underneath. The tweaks appear to be small, and the iFixit folks are still on the fence about precisely what’s new here, but things do appear to line up with what we were told by the company.