Watch for the inevitable explosion of videos with important content (like "Apple sucks") placed in such a way that it will be hidden behind the notch.

They've designed it with maximum meme potential.

Yeah, some bizarre asymmetry there. I'd have preferred they just shrink the top/bottom bezels, similar to the Galaxy S8 or LG's V30. I can't see "the cutout" aging gracefully.

I wouldn't be surprised if you could double-tap to zoom out, like when watching 4:3 videos on the current iPhone.

They do that—there's a video in this thread somewhere that shows it.

They said that you CAN do that, the screen is wider than 16:9 so normal content will already be presented with black bars on the side anyway and you never have the notch covering content .

I'm sure they're going to let you make the status bar black to make the notch seamless.

That's what I assumed was going to happen, but nowhere in the keynote was it black.

It was black in Apple Music (now playing view).

I never hold my phone with my thumb on the top... I have it cupped into my palm and if I really need to "hold" it I grasp the sides. Why is your thumb on the front?