I don't have any problems with the rumoured specs. Yes I agree that the mp/s is a little low on the FF output for a dual Digic V (32*5=160mp/s). The chipset is more than capable fo delivering 7.5 fps at that resolution. I also don't have a problem with the APS-C and APS-H crop modes. Sure the maths isn't right, but Canon did say that they were researching dual density chips. So it's quite possible that this new sensor has a higher pixel density in the 1.3x zone and 1.6x zone respectively. I'm also wondering if the higher pixel density and the need to split the sensor read out has something to do with the lower fps? As to concearns about the view finder, Canon have implemented an LCD screen in the 7D with grid overlays. I'm sure it's possible for Canon to have corresponding crop lines or even View finder black out crop edges when switching formats. It's not hard or difficult tech to implement.
I think the big question with this camera is what price point? Also looking at the specs, there's still a lot of processing capacity in the chip set for a higher resolution camera to sit above this unit in canon's heirachy. Maybe a 48mp 5 fps 1DsV? Who knows!