If they change screen sizes, I think there's only one way to do it: keep the width the 640 pixels it currently is, and add to the length's 960 pixels.
This means that even apps designed explicitly for the 3:2 ratio would work fine, they'd just be pillar boxed. Most current games would end up like this.
However, I'd think apps like Safari, Mail, etc, which have controls at the top or bottom, would work with little trouble--the viewport would just be expanded, and the controls would still stay locked to the top and bottom.
You can't do 16:9 evenly with 640 pixels in height. 1.85:1 would work out obviously, and is close enough to 16:9 that most people wouldn't notice.
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