Yesterday (2012 May 31), Microsoft released another Windows 8 version: Windows 8 Release Preview, which is newer than Windows 8 Customer Preview.
Check this official blog to get more detail information about the Windows 8 new version:
There are some people are waiting for their next computer just because they are waiting for final formal Windows 8. However, maybe you do not need to wait but just go to buy a Windows 7 computer, because first Windows 8 can run on all existing computers, the second is the most point that Microsoft promises they will upgrade your Windows 7 to Windows 8 with only around $14.99:
"…Are you really excited about all the new PCs available today but thinking about waiting for Windows 8? Well you don’t have to. We are also announcing today that starting on June 2nd, 2012, Microsoft will roll out the Windows Upgrade Offer in 131 markets including the US and Canada. Consumers who purchase eligible Windows 7 PCs that are preinstalled with Windows 7 Home Basic, Home Premium, Professional, or Ultimate and include a matching and valid OEM Certificate of Authenticity through January 31, 2013 will be able to purchase an upgrade to Windows 8 Pro for $14.99 (U.S.) which will be redeemable when Windows 8 is generally available (the program expires in February 2013). "