Earlier quoted context omitted.
They needed to give you reasons to buy the iPad 3 of course.
Does anyone seriously think they are deliberately holding back?
You can be certain that somewhere in mid 2010, there was a higher resolution version of the iPad 2 that was either in the first group of ten, or possibly even down selected to the final group of three. For reasons of cost, power consumption, or, perhaps competitive pressure (Nobody else was coming out with a tablet with a high resolution, so they could hold off until the iPad 3, or possibly 4) that was not the product you saw today.