For those of you who have upgrade your Intel Core systems without dedicated graphics cards to the Windows 8 Release Preview, Intel has released a graphics driver for Intel HD 2000, 3000, and 4000 graphics. Intel HD 2000 is the pre-Sandy Bridge graphics controller, Intel HD 3000 is the Sandy Bridge graphics controller, and Intel HD 4000 is the Ivy Bridge graphics controller.
This is only for the Windows 8 Release Preview, if you have any version other than that (like the Consumer or Developer Previews), this driver will not work correctly. The links below link to the state download pages. You can read the announcement here.