In the What's New thios is described about "Improved DPI Awareness":

The Windows Framework implements the new Codejock capabilities and automatically selects the best icon size for the DPI setting of the display when using resource icons (compiled in). We replaced all our simple, single-size icons and bitmaps with Icons that contain multiple sizes (16x16, 24x24 and 32x32). You may face the same decision about adding icon sizes.
The delivered icons also contain sizes like 20x20 and sometimes 28x28. Are these sizes actually used with DPI scaling? I am using several custom icons and I want to know which sizes I have to support.