The main 2 reasons why none of these manufactures offer screens above 1024x600 is :
1. It's a major expensive for them as the LCD screens need to be specially made.
2. More pixels means more power consumed and higher CPU usage.
We'll need to wait until they run out of stock of the old screens and decide to build one with a decent amount of vertical resolution and LED backlight.
Wait for the Next Generation
The main 2 reasons why none of these manufactures offer screens above 1024x600 is :
1. It's a major expensive for them as the LCD screens need to be specially made.
2. More pixels means more power consumed and higher CPU usage.
We'll need to wait until they run out of stock of the old screens and decide to build one with a decent amount of vertical resolution and LED backlight.