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One interesting thing he brought up is that as a developer, you can't develop as if everyone is using a 3D Touch device, because they aren't so you just add some enhancements to your product for the 6S(+) users.

This means among other things, it will be easier for Apple to abandon the idea if it ends up not being worth it, since it is such a small part of the UX of the devices, or even replace it with some other mode of interaction.

I still get the occasional app update adding support for Touch ID. So I think with hardware features like these, the full potential won't be completely realized until these devices are a few years old and it's near impossible to come across someone that doesn't have that feature on their model of iPhone.

The first video really impressed me. It genuinely looks like he is depressing a 3D button into the screen. I was pretty skeptical of the name "3D Touch" at first, but that video sells the idea better than Apple did.

It would be neat to adjust how fast a video is scrubbed using 3D Touch (I have a 6, so have no idea if the Photos app does this already).

That last video could make for an interesting small game.

3D Touch: Beyond Peek and Pop