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I don't see what is wrong with the current ipad display. They wouldn't go further than retina, there isn't any point
 
I suspect it will have;

1.) A9X processor - which will probably be even quicker than the new Mac Airs considering the current Air 2 is as quick as the current 2014 Mac Air.

2.) Retina HD screen

3.) lighter

4.) but the big news in the line up i think will be the iPad Pro!
 
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