This only effects end user consumers of tablets, handsets and whatever other junk Microsoft peddles on the portable market as they have this laughable secureboot enforced on them. Laughable because CAs are 20th century technology and anyody can get a cert and sign away whatever they wish.
I guarantee somebody will null out the UEFI instructions for secureboot or find a way to bypass it within a month of Windows Phone 8 being released and then tell the world how to do it, rendering all this work a waste of time, effort and money.