The only thing that looks remotely interesting in that concept video is the the phone that can also fold out into a tablet. That's actually useful. The only problem with it is that do be able to fold out into a widescreen like that, you'll need a wider device, which doesn't fit the shape of most modern phones or phablets.
The other shown where the screen pops out or the actual hardware demonstrated in the keynote are far less practical. They're far less usable than today's devices. Imagine actually trying to use one of those. It would be a pain. Imagine trying to hold one and actually type on it.
The other curved display device shown in the keynote could already be made today and really doesn't demonstrate a flexible display as it's just curved like that and built into a rigid-bodied device. It's an interesting idea, and I'd like to see them turn it into an actual product, but I don't see how it has much to do with the other flexible displays that they've demonstrated.
You should work in product design, your ideas are awesome.
I haven't proposed any. I've merely pointed out that other ideas have a whole mess of implementation and usability problems. If I knew how to solve them I'd be getting rich right now. Unless someone can actually do that, they'll just shove out some gimmicky product that will be a nightmare to actually use.