>>Microsoft did outline significant details for Windows 8 in the blog post at http://blogs.msdn.com/b/b8/archive/2012/02/09/building-windows-for-the-arm-processor-architecture.aspx.
>
>Saw this the other day :http://www.bbc.co.uk/news/technology-16980442

And in this article you point to related to ARM based Windows 8 computers:

applications written for other version of Windows will not automatically work on WOA, a potential challenge for consumers.