There has been some buzz about it and it seems as if its finally Windows 8.1 is here as an preview. Now you can take a first-hand look at many of the new features and improvements with the Windows 8.1 Preview.
For a more complete look at all the features in Windows 8.1, check out the Product Guide.
Before you install the Windows 8.1 Preview, it is also highly recommended you backup any files you have on your PC or tablet first. Please see the Windows 8.1 Preview FAQ before installing, which includes information on how to go back to Windows 8 if you need to. There are certain cases in which you will not be able to go back to Windows 8 after installing the Windows 8.1 Preview so please read the FAQ before proceeding.
So head over to the Windows 8.1 Preview page on Windows.com. The Windows 8.1 Preview will be installed through the Windows Store. Please see the Windows 8.1 Preview FAQ for the minimum requirements needed to install the Windows 8.1 Preview.
Here is the Download Preview Page: http://windows.microsoft.com/en-us/windows-8/download-preview
ISO file Download (no yet available **** Its aviable now): http://windows.microsoft.com/en-us/windows-8/iso-preview