375 x 812 points (about 19.5:9) is very close to the shape of recent renders that incorporated the leaked alleged faceplate. Just slightly taller in shape than those renders. (And the camera "dip" would cut into the 812.)
If the faceplate/screen protector is a real leak (who knows) then I'd say 375 x 812 is the ENTIRE screen—no additional "function areas" or anything like that. (In which case, I can see apps being offered the option of a smaller size--maybe the source of the 5.15/5.2" rumors?--that slices of the top and bottom so the camera/speaker "dip" and the round corners can be ignored. But still taller than 16:9.)
Which in turn means, IF the leaked part is real, AND these server stats aren't pranks or something else, then Ming-Chi Kuo would be half right (resolution) and half wrong (function area vs. "useable area").
Which ultimately means we still know nothing! Good fun.
(As for 3x retina, no I don't think we need it. But Apple's chips are fast and efficient, and I think it's been clear that's where they were headed. If/when it happens, it will be fine.)
P.S. If that point size is real, I expect Apple would want that 375-point width to physically be identical to the iPhone 7 screen width (so, larger than the article speculates).
In that case, the diagonal size of the new screen would almost exactly the same 5.5" as the Plus—but that diagonal would be across a tall-and-narrow shape (and with corners trimmed off) off. So, still less area than my beloved Plus. I'd still consider it as a possibly OK compromise for pocketability, halfway between the 4.7 and the 5.5". (Cropping off the rounded top and bottom leaves about 5" diagonally of pure rectangular screen area.) The rumored camera/speaker "dip" wouldn't bother me—that part of the screen just wouldn't be used all the time, but would cosmetically look nice when it was.
