Their has been news on different forums regarding Windows 8,Pre Alpha Build 7312.The build version has been reported as 7312-0-090703-1400.According to them the build has been available on Connect.
Though we would like to confirm that this build is fake and don’t bother to download it,if you see it on various torrent sites
We would keep you updated about Windows 8 as and when it’s first legit built is available.