Microsoft officially launched Windows 8 at an event in New York City on 26th October. The new touch optimized OS from Microsoft comes with a new Modern UI, first class tablet support and is available in more than 140 countries around the world. You can find a comprehensive list of details about Windows 8 here.
Windows 8 is available in two version: Windows 8 and Windows 8 Pro while Windows 8 Enterprise is for large organizations. If you have a PC running licensed Windows 7, Vista or XP then you can upgrade to Windows 8 Pro for just $39.99 (limited time offer) while the DVD can be shipped to you for $69.99.
However if you are curious to try the full Windows 8 version before buying a license, you are in luck. Back in August, Microsoft released the final version of Windows 8 to TechNet and MSDN users while at same time the software giant made available the 90-days trial version of Windows 8 for everyone to download which is still available after launch.
Remember, this is trial version and will expire after 90 days. It is not possible to upgrade the evaluation to a licensed working version of Windows 8 either so it is recommended that you should install it on a virtual machine or a test system.
You can download Windows 8 90-days trial version from here.