Microsoft today released the Windows 10 SDK Preview Build 18290 for developers. This SDK can be used with the Windows 10 Insider Build 18290 or later. This updated SDK comes with bug fixes and changes to the API surface area. Microsoft has added a blend mode to the effect graph of the AcrylicBrush called Luminosity. This will make sure shadows don’t appear behind acrylic surfaces without a cutout. Microsoft will also make LuminosityBlendOpacity API available for tweaking that allows for more AcrylicBrush customization in the future. You can find the list of new API additions here.
The updated Preview SDK can be downloaded here.