Beckler8: The extra controls for vertical shooting aren't needed. Why is a rectangular sensor still being used? Switch to a square sensor and either crop later, or in-camera with viewfinder masks, or whenever. Square also obviously captures more of the image from the lens--info. that is lost for no reason. Any possible reason not to do this, other than a slightly bigger sensor? (Though not necessarily). I don't think so, other than lack of thought.
It would actually be a 50% larger sensor. 36mmx36mm. The way semiconductors work this would raise the sensor cost by more than 2X. That could very well be $1000 or more prior to manufacturing. That's one reason why there are no larger sensor cameras under $15K or so.