We don't have any plans to offer the product in a vertical orientation. There's a few reasons:
1) LCDs are made to be viewed at certain angles. The displays we use would not work well rotated 90 degrees. We could go for a full custom LCD, but that could double the cost of the product and we'd end up with a year delay like Garmin did on the G600.
2) The 10" is basically as high as the 7" would be if rotated. I doubt many panels can support the 10" vertical. So if you want a tall map, just buy a 10" display. It's the same size as two 7" verticals.
3) The knobs and buttons would not work well in a vertical orientation, so suddenly we're talking about a whole different product in software and hardware. The volume probably doesn't justify this.