Who?

The ARM based version of Windows 8, and Windows Phone 8.

EDIT: Development-wise, its quite brilliant. You won't have to rewrite your whole game when you publish to RT or WP8, just make small adjustments to be compliant with the devices' resources.

Still not sure what that is, unless it's android based?

Well, you see, we're (in our laptops and desktop machines) using processors that were built using the x86 architecture (CPUs by Intel and AMD).

The ARM processor architecture is less powerful performance-wise, but has lower power requirements and thus it is used for processors meant for phones, low performance tablets and similar stuff (CPUs by Qualcomm, Texas Industries, NVidia, and.... the last manufacturer's name escapes me right now).

ARM is a very popular processor architecture for small devices (phones, tablets, ...) Windows 8 will come in a version for said architecture, called Windows RT. It's different from Windows Phone 8, but Windows Phone 8 is - unlike Windows Phone 7, and earlier Windows Mobile - based on the desktop version of Windows.

I see, thanks for the explanation.

So do android computers use the arm architecture or is that something different too?

Most of them, yes. At least, I don't remember seeing an Android based machine with a x86 CPU... although I think Intel may be making a phone using a x86 CPU (rumors?).

Android devices, and, indeed, Apple's portable devices, do use the ARM architecture almost all the time, yes, as well as earlier Windows Mobile devices.

Good to know guys. My knowledge of portable devices is poor.