If you're into it you can watch tech youtubers go to those big conferences where they show off prototypes of their newest tech, earlier this year they were demoing rolling and pull out screens on phones and laptops, among other stuff.

For the batteries your outta luck for now due to a SOB called physics.

Companies make what sells, and flat candy bars sell. All the companies you mentioned went out of business (at least in the smartphone sector) due to not selling iPhone clones. I'm not saying that's a good thing btw. I wish we had hoverboards & holograms too dude.

I'm pretty content with my folding phone for now though.