The terse comment "Pro Grade AF (not like 7D)....just the wording makes me think this is made up...like the guy has a beef about the autofocus situation (which is lackluster).. on the 5DMark II and is just venting.
I think this rumor deserves the CR 0.5 rating.
From what I've been able to tell reading this forum is that most 5D users would be very happy with the 7D autofocus. Seems a bit condescending to me to make a point of saying the 7D autofocus is not "pro grade." Certainly not something anyone connected to or knowledgeable about Canon would likely say.
I would not be surprised if the 5D and the 1Ds have different sensors. But, more than twice the mp? Sounds unlikely. 24mp seems too low for the 5D (I would expect the next 7D to have 24mp). This sounds like a "bigger and fewer pixels" fetishist wishing for the least possible increase in the 5D.
1Ds with "decent" 6400 and 5D with two stops more than current model or 102,400. That would likely mean the 5D would have better low light performance than the 1Ds. I don't think so.
All-in-all, this is the kind of spec list that anyone on this forum could come up with. Recycle and modify old rumors, make it somewhat plausible and then see if you can get it published.