I'm a bit curious why both the 24" and the 32" are priced over 1k, yet they are able to get the 28" down below that mark. That's not to say that I'm not incredibly excited to see how this ends up! I've been looking for a sub-1.5k 28" monitor with high resolution for a while, and though I love my Apple Thunderbolt Display I use at work, I am hesitant that if I buy one for myself, I'll be buying right before a refresh.…
Unfortunately, the 28” is going to have the wrong pixel density to use with OS X in Retina mode. Non-Retina MacBooks start at 110 PPI. Cinema Displays have hovered around 100 PPI for about a decade, with the 27” Thunderbolt Display topping out at 109 PPI (same for its sister 27” iMac). At 28", a 3840 x 2160 panel has a PPI of 157, which, dividing by two to get the equivalent non-Retina PPI, comes to only 78.5, a redu…
It's going to be pretty heavy on GPU's mind. The rMBP's do it by rendering a 2x density frame and scaling it down for the display. This means the GPU will have to render a 5120x2880 pixel frame and scale it down to 3840 x 2160.