Sounds good to me.
Now... I just hope Gruber is WRONG about 3x (~460PPI) on the 5.5"... A battery-burning high DPI you can't even see in any normal use. (Only sounds good on paper. I wish other companies hadn't started that trend.)
But I fear he's probably right. 3x coupled with Gurman's "point" numbers works out logically the way he describes.
I'm sure battery life will still be OK, and I'll probably try the 5.5" just for novelty (I can always change back in a couple years). But I'll also know the battery life could have been even better with a saner PPI: if all sizes of the iPhone kept the already great (and developer-friendly) 326 PPI, giving the 5.5" 1564 × 880.
1080p and beyond is marketing fluff (and yes, it works well for that) on a pocket device.
Completely disagree. The HTC ONE, for example, has a NOTICEABLY a sharper screen than any Retina iPhone. It's not even close.