The only icons in hicolor here are pattern-* for yast-packager. Other icons are shipped with the module that uses them.
Oxygen and Crystal themes are still shipped, but pretty much deprecated due to lack of maintenance.
This is the fancy YaST theme used in the Qt installation workflow.
openSUSE/wizard counterpart to
yast directory of the openSUSE branding repository.
All icons will be stored in /usr/share/icons/.