Every time after a new product of Apple comes out, the owners of the predecessors begin to sell their old product for the new one. However, this time they can hold it and keep the ipad 2, because it would not be so obsolete this time. The new one does not change so much that make it look bad. Actually the new ipad should be called ipad 2s. Maybe that's why it is not called ipad 3.
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According to Phil Schiller, Apple's senior vice president for marketing, the new tablet is not named "ipad 3" because "That would have been too predictable". Then why the new ipad? It looks just like the ipad 2 and it just have been enhanced in some aspects. So it should be called ipad 2S maybe, just like the iphone 4s.
The biggest update on the the new tablet is a far crisper Retina display with 2048*1536. The display is said to be the sharpest ever on the mobile device, four times sharp as the 2. This screen has 3.1 million pixels, which is 1 million pixels