Scientists just voted to redefine how the world keeps time

Today an international group of scientists, diplomats, and timekeepers voted to end the leap second, which has been keeping Coordinated Universal Time (UTC) aligned with the time according to Earth’s rotation (UT1) within one second of difference.

A new system, called the “leap hour,” will allow the Earth’s rotation and official time to fall out of alignment by a full hour

www.scientificamerican.com/article/scientists-vote-to-end-leap-seconds-redefining-how-the-world-keeps-time/

What will happen to things like GPS that depend heavily on time, but cannot easily be reprogrammed in all devices that use it?

I think it shouldn’t matter. IIRC, the GPS algorithm depends on time differences, not absolute time. As long as the satellites are coordinated with each other, receivers won’t care which parameters the absolute time matches.