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HANG ON...
I just did the math and a 2560x1920 res screen gives you 333 dpi. True, that's near the range of the iPhone's resolution, but don't forget that Steve said that the magic threshold for indistinguishable pixels is somewhere near 300dpi, IF you are holding the screen 1 foot away from the face.
Let's say that the iPad, instead of getting an upgrade to 2560x1920, was just pixel doubled on both dimensions. That would be a resolution of 2048x1536 (just multiply 1024x768 by 2 to get that).
A screen with 2048x1536 yields a ppi of 264. Considering a phone is held closer to the face than a tablet, Apple marketing could fudge the "retina threshold" to a lower number since a tablet is typically around, let's say, 1.5 feet from the face. Thus a ppi of 264 is perfectly reasonable to deem "retina display" and it solves the development problem of upgrading existing app assets by cleanly doubling the resolution required for graphics.
I'm not saying Rose is right, but it very well could be possible to have a "retina" display on the next iPad.