Breeze Icons follow the colorscheme that’s not new but now the folder icons also follow the color scheme.
That’s how it look like with the breeze color scheme
as you can see there is no difference between the old and new folder icons but if you play with different color schemes in the color setting, …
you see there openSUSE, Manjaro, Krita, Ubuntu, Elementary, Arch Dark and any other style you would design by yourself. So don’t stop playing with your plasma desktop, it’s designed for your flavor.