The problem with the Ipad HD is that there aren’t any apps that need that high level resolution at this time.
But the good thing is that, now it’s here, something will be written for it that couldn’t be useful earlier.
There’s always a down the road purpose for such features with Apple. They’re actually telegraphing near term product introductions, if you’re familiar with the rest of their so-called ecosystem. The other players aren’t really even playing the same game, only part of it. That’s why they’re so tough to compete with, on top of almost always executing with very few flaws.