DoF is basically selective blurring. So what was your point?
My point is that depth of field is a really advanced cool looking effect, and while it's included in the iPad 2 version, it's not in the latest iPad version.
it's not simply "selective blurring", it's a technique developers use to enhance the experience.
It adds scale, it helps provide focus to the player and it adds a movie like quality to the visuals. It's not just blurring bits of the screen, it's calculating what should be in focus and out of focus, and by exactly how much, against a variety of different criteria for a variety of different reasons.
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Of course, for most high end games (or certain high end effects) the iPad 3's SGX543MP4 won't be enough to run it at the same frame rate at 2048x1536 as the iPad 2's MP2 at 1024x768. But it does pretty well. They have had to make a few sacrifices but still the game looks great and imo the crispness outweighs the lack of effects.
See for me, the effects outweigh the higher resolution. So I'm happy they are giving us a choice.