I was syncing my iPad 3 to iTunes to install my old iPad 2 apps. I had couple of iPhone apps inc Plants Vs Zombies. As you all know the iPad only runs the regular iPhone apps not retina. I actually deleted my iTune copy of plants vs zombies and downloaded it again. When I installed in onto the iPad 3 im pretty certain is looked considerably more detailed than i remember it being on iPad 2. Im not talking about the retina screen, the artwork itself looked much more like the original iPad version compared to the low res iPhone version. I cant be 100% sure but i think I might have downloaded the retina version. My point is, I think if you delete your iPhone apps from iTunes and then redownload them they download the retina iPhone version if you have the iPad 3. Has anyone else experienced this?