Unfortunately, I haven't been able to afford a new iPad yet (nor have I had time to drool over one at the Apple Store), but I've heard from many of you just how amazing that Retina display is. I'm not surprised. The iPhone's transition to the Retina was great, and it must be even better on a larger scale.
Of course, there's a tradeoff for having graphics that look this great in a universal app. Developer Justine Pratt has run through a few of the pros and cons of going universal.
The most obvious drawback is app size. Those bigger graphics take up more space, and for many graphics-heavy applications, that could put t