I don't really care about the screen resolution, as long as the battery life doesn't suffer.
My God! The screen resolution and quality of the display is what will make it look magnificent! Even if you need major reading glasses you'll still see the difference!
I noticed better color going from the iPhone 3GS to iPhone 4, but this is completely different because the display will be yet another technology, and with 52% more pixels than 1080p!