There are improvements for everything, from XWayland, XFree86, xf86Crtc, XQuartz, and Xephyr, to things like Randr, GLX, DMX, Xi, systemd-logind, Mode Setting, DRI3, and Glamour. Therefore, we strongly recommend that you read the attached release notes if you are curious to know what exactly has been added, removed, or fixed in this release.