The next iPad will likely have a higher resolution, but the "retina" display came about because an exact doubling of resolution makes upscaling images very easy and because Apple could still get a good price on the screens. Then marketing came along with the retina sales pitch. Note that I am not saying that Apple does not care about screens way more than the typical device maker, just that quality isn't the only factor.
I assume the iPad has broken Apple's fixation (in software) on one screen resolution, so there is no need to do an exact doubling again. Apple will likely use the highest resolution that is economic and practical for a ~10" screen. Part of the "practical" will be whether the graphics controller can process that many pixels.
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