Windows 8.1 Update is indented to make it easier to use the Windows 8.1 for the people who do not have a touch screen (or can say who use keyboard and mouse more). The following video will show you the new features and adding screenshots of this update below that video.
It is expected to release tomorrow while if you have an MSDN or TechNet subscription you can get it now itself- posted here. I just installed the updates on my PC. Here are the screenshots