I would be shocked if the next iPad had a retina display - at that screen size, the resolution would be slightly more than 2560x1600. While it would look fantastic, I agree with others who have mentioned that that is an unreasonably high burden on a processor attempting to last 12 hours on a battery charge and keep the heat to a minimum.
In addition, doing games at that resolution is not even done by the commercial desktop market, so most would have to scale down. And no one sells video that plays at that resolution; not to mention that selling and distributing movies of that size would require better bandwidth than hardly any people have available to provide a good experience for the user.
In short, it doesn't make good business sense yet to sell an iPad with a resolution of 2560x1600. While I don't doubt that it will be higher than the current resolution, it's not going to sport a retina display for at least a few more years.
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