Touch Arcade noticed something interesting about the new iPad that you might not have seen yet. Specifically, it uses Retina Display graphics meant for the iPhone 4 and 4S displays when doubling the size of non-universal iPhone apps.
This is a small use case these days, as many popular apps are universal. But there are still a few apps without dedicated iPad compatibility built in, and the new iPad will now use the Retina-style graphics when pixel doubling the image.
The screenshot above is a representation of what it looks like. You'd only be able to see the real difference on a new iPad's display. The upscaled graphics still aren't as perfect as full-sized iPad graphics, but they look much better than the original iPhone-sized versions, especially when spread across the new iPad's big screen. This means even apps that aren't designed for your iPad (but have built-in compatibility for a Retina Display) will look much better than they did before.