'05???? If they were going to slip it in as an '05 model, we would have known just about every detail regarding it months ago. Maybe for '06, but Ford's been totally tight-lipped. Hell, they may do a Boss, or a Bullitt first. Nobody knows.
I doubt Ford would bother with a special edition 05 considering the entire car is a redesign. I'm hoping 06 with the Cobra coming out they may try to fill in the gap in price between the Cobra and GT with the Mach1 or BOSS. Or they may just wait it out since most car redesigns last about 7 year cycles we have a while till Ford needs to boost interest with special editions.