Recently Microsoft released Windows 8 RTM (build version: #9200) to the OEM Manufacturer and mentioned that the product will be available to the MSDN/TechNet Subscribers on 15th August 2012 and will be available for general public use on 26th October 2012.
As per their commencement, the product is now available for download. Find out the links to download the new OS from Microsoft. Also there is a link to download the 90 days Trial version.