Windows 8.1 Miracast?

I remember reading somewhere that Windows 8.1 has native support for Miracast wireless display streaming. That's great, but I have a question that I just can't seem to find the answer to. Is this Miracast support only for a specific set of new devices with certain hardware, or will it be for all Windows 8.1 PCs? I only have one Windows 8 device to run the Preview on. And that would be my Surface Pro that I'm currently using as my main PC, so I don't want to install the preview at the moment due to potential bugs and stability issues. Of course, that means I can't test this on my own. Once the final version is out, will 8.1 allow my Pro to use Miracast, or does it not have the correct hardware for that function?