16.7MP sound too low a megapixel count for two reasons:
1) in combination with the high price and the relatively low fps, one of the 3 factors has to change, either increase the fps or the megapixel or reduce the price.
2) if this materializes, it'll be considerably lower in pixel density than 1DIV and if I'm not wrong Canon has never before gone to a lower pixel density than whatever they have/had in their latest 1D.
if the megapixel and/or the fps are increased (plus maybe adding dual card slots and weather sealing), the specs will be about you'd expect from merging and "budgetizing" the 1D+1Ds lines.