Microsoft Shared in build 2013 about latest creation which is Windows 8.1 & VS 2013.
You can check out the video of build keynote 1 at Keynote1
and Keynote 2 at Keynote2
Enjoy the videos.
You can enjoy preview version for windows 8.1 at http://www.microsoft.com/en-us/windows/enterprise/products-and-technologies/windows-8-1/default.aspx
You can take a look of Visual studio 2013 preview version at http://www.microsoft.com/visualstudio/eng/2013-preview
Thank & Regards,