A few points I find interesting:

- in 2022 a decision was made to abolish leap seconds by 2035, by allowing UTC to drift from the time as defined by Earth's rotation (UT1)

- negative leap seconds, while established, were never actually used

- ice melting caused by climate change has a slowing down effect on rotation of the planet, delaying a need for a negative leap second until 2029, otherwise forecasted in 2026