Scientists are hoping to redefine the second – here's why

Most likely indirectly, like how GPS has to account for satellites not matching the passage of time on earth due to relatively.

You can now be more accurately late for work. Or your coffee is more accurately taking a long time to come out.

Relativistically.

If they can predict earthquakes and eruptions more accurately, as suggested in the article, then yes for all the people who don’t die.

I better not have to buy a new watch because of this.