Hopefully the one saving specification the Canon could have at this point might ironically be the 11 point AF system... wait, I know what your thinking, hear me out...
From what we've seen of both Nikon's and Sony's offerings, they're using AF modules borrowed from their APS-C cameras, meaning they occupy a tiny little fraction of the frame, all clustered into the centre. Aside from subject tracking, which these cameras are not made for, and which the Sony will (based on specs alone) probably only marginally excel at, having all the AF points in the centre is a nightmare for all sorts of photographers who would like this as a secondary body, and for those people as basic as an 11 point AF seems, its better than a "19+109 point" that covers a fraction of the frame.
Here's hoping that Canon manage to bring out the only entry level FF with FF AF.
AF systems are basically the same size for APS_C or APS-H or FF so not sure what you mean buy that....
mmm.... are you sure? I was very much under the impression that AF area was linked to prism size which is linked to sensor size.
Look at the AF area coverage of the D600 here : http://forums.dpreview.com/forums/read.asp?forum=1021&message=42484333
And the Sony A99 here: http://4.static.img-dpreview.com/previews/sony-alpha-slt-a99/images/screens/AF-Range.jpg?v=1581
Both, but particularly the Sony are tiny compared to the frame coverage of any of the 5D's.