If they make ANOTHER screen resolution, I'm going to kill Apple. Having more than three screen resolutions is kinda annoying, right? Especially for the devs. GRRRR at least the aspect ratio will be the same.
Anyway, I think a resolution boost may happen in the next model. Probably not to 300 ppi but if they increase the resolution to make it sharper and call it "retina display" how will the average Joe tell the difference?