IT's true BS that Apple doesn't provide more information about this update. They must be hiding something....
I unpacked the update and its just an Nvidia driver and GL engine update. Definitely should be a good thing.
Note: From what I can see, the default LCD profile is
not changed.
List of updated files inc...
/System/Library/Extensions/GeForce.kext
/System/Library/Extensions/GeForce8xxxGLDriver.bundle
/System/Library/Extensions/GeForceGA.plugin
/System/Library/Extensions/GeForceVADriver.bundle
/System/Library/Extensions/NVDANV50Hal.kext
/System/Library/Extensions/NVDAResman.kext
/System/Library/Frameworks/OpenGL.framework/headers
/usr/libexec/oah/Shims/GLEngine.bundle
/usr/libexec/translate