You know this 2880x1800 screen will look like a 1440x990 with sharper text, right?
Unless you can choose it to run in HiDPi or regular mode, though
Hum... 2880x1800 is 1440x900, only "sharper". Quadrupling the pixels is nice. Keeping the same real-estate while doing so.... yuck.
Let's hope this is for the 13" model, not the 15". The 15" at the current 1440x900 is abysmal. The "optional" "hi-res" display (all in quotes yes) should be standard. There should even be a 1920x1200 option for the 15".
It looks likely you could run at full 2880x1800 rez with tiny elements
At least that's how the config looks like on today's computers (1440x900 screen). So if the same pattern follows, you would choose between:
2880x1800
vs
1440x900 (HiDPI)