I'm unaware of the W3C controller. Sounds interesting. I'll look into it. If Ludei doesn't release the next version of CocoonJS by the next keynote where Apple is expected to announce controller support for iOS7, it won't be the end of the world, but fingers crossed! I think it would be a small boost for the first games that support it. Apple is already approving games that support it.
I wasn't sure how much collaboration, if any, was needed to make it work. It's good to know that it will work straight away! I emailed Ludei yesterday, and I got a nice response from them saying they are interested in supporting the controller. With any luck, it won't take long to implement!
I don't know the specs for the Mac mini. Can you already plug it into a TV? HDMI or something? There are already controllers for OS X Mountain Lion , so you can probably do that now if you want. A lot of people are hoping Apple expands the capabilities of Apple TV to play games, then it would compete directly with Ouya, PS Vita TV and other consoles. It's a possibility.
(Edit: corrected spelling)