I think about implementing a prescale function like glScalef() for all opengl output.
So long as we have the option to use 1024x768 & 2048x1556 resolutions on the iPad 3rd gen. I'd certainly like to make sure the latest versions of my games are optimised for the iPad 3rd gen while still supporting the earlier models. It won't be a solution to simply scale down for older devices as that would be a huge memory hog.
Ideally we'll need to know / have.
1.. Know which device the app is running on (I know there are plugins on this forum but for many a simple command would be of benefit)
2.. Force use 1024x768 even on the iPad 3rd gen as not all games need to be "retina" (even though it will be scaled up)