Earlier quoted context omitted.
No that's plain wrong. Microsoft is demanding that only for Windows RT tablets. The same manufacturer is free to make tablets that run Android or Ubuntu or whatever.
Apparently, that's not true. Atom Clover Trail devices will not support anything but Windows 8, and I don't think it's just a driver issue. It's a bootloader issue, too: http://semiaccurate.com/2012/09/27/intels-clover-trail-is-a-...
Let's be clear: the rules for Windows 8 certification is that manufacturers must allow the user to disable secure boot and allow them to install another OS. This is the exact opposite of what people here are arguing. There is a lot of FUD being spread, and it's just not true.