WOW.
Apple hit it out of the park with this one. There are times using my iPad (which I'm doing right now) where the screen starts to remind me of a Kindle reader. Thanks to retina resolution pictures look fantastic and I can't see any pixels on text. The display is so close to the face of the device (since the gaps and thick screens have been eliminated over the years) that it seems like the pictures on the surface of the device. Now with TrueTone the white point on the display seems to match what's actually in the room.
The end result of all this is that, much like a Kindle, the display seems to "disappear". It times you get this interesting little fact were you feel a bit like you're reading a piece of printed plastic. The giveaways that it's a computer screen of been minimized to such a degree that you can almost trick yourself at times.
I don't know where I'd find some images that use more than the standard sRGB to see what they really look like on this iPad, but just from what I've seen with normal content I'm quite impressed. I really hope Apple includes this technology in the iPhone 7.