I'm fascinated with the iPad "3" rumors because on the surface they make so little sense. Apple just shipped the iPad 2, no competitors can match it, and demand is strong. Why mess with a good thing so soon?
But it almost fits when you give it a name like "Pro" (or iPad Retina, or whatever). This isn't a replacement for the current iPad; it's another layer to the product lineup. And like the awkwardly-named iPod Photo from 2004, I bet the iPad Pro is meant to be temporary. It's a way to sell a high-end, over-priced and over-pixeled iPad before the technology is cheap enough for the masses. A year or two from now, the Retina Display will be available in all iPads, and the "Pro" name will fade away, just like iPod Photo did when all iPods got a color screen.