Windows 8 is a lot in news… leaked Welcome screen, Ribboned User Interfaces… etc. This Blog from Zdnet’s Mary Foley explains some more about what might be included in Windows 8 which is said to be released in 2012 or later.
http://www.zdnet.com/blog/microsoft/microsofts-windows-8-and-the-i-word-immersive/9092?tag=nl.e539
Windows 8 kernel might also be 128 bit compatible.
http://www.pcpro.co.uk/news/353491/windows-8-set-for-2012-release
Windows 8 is also said to run on ARM processors check out the following link.
http://www.microsoft.com/Presspass/Features/2011/jan11/01-05SinofskySOC.mspx?rss_fdn=Top%20Stories
Further Reading:
http://www.tomshardware.com/news/windows8-win8-immersive-browsing-mode,12513.html#xtor=RSS-181