So what does this mean for you? It means that if you have a windows 8 device running on an ARM processor, you will not have the ability to install any other operating system onto your device, even if it's another version of windows.
Phones like the iPhone or any Windows Phone 7 device have had something similar to this since their iteration, which should not come as a surprise to anyone. But this decision does give users some hard choices to make when it comes to purchasing a tablet running Windows 8. For example they will not be able to install Android, or even the upcoming tablet version of Ubuntu if they so wish.
So when you go to a Windows 8 tablet, but want the ability to have complete control over your it as you would your PC, make sure it's not powered by ARM.