Major increases in capability & capacity. Good stuff, too. Not quite as good as our best, but way better than the Norks.
That Polish order alone is pretty impressive, and no way S. Korea will short itself 1st. It appears Obama (and to some degree Trump) scared ‘em the US might not always “be there” except in case of a nuclear attack.
Last that I saw, the South Koreans weren’t spending jack on defense, instead relying on the US tripwire (which is now gone, except maybe regarding nukes), but I admit that was a few years ago. Maybe Trump had some luck. Anything ordered this year is obviously useless in the short term.