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Doubt they would get rid of the 15. A lot of people use it as their primary computer for their "pro" work. It would need to be as powerful or more than the current 15 maxed.
 
This is the future of displays

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They can retain display size while making chassis smaller so 13" is in the body of a bit over 11" model and 15.4" can be packaged into 14" housing.

Im surprised this didn't happen earlier. Personally Im holding onto that someone will make bezeless 17" that fits into your typical 15.4" housing.
 
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