https://techcrunch.com/2018/11/07/samsung-folding-phone/

As rumored, Samsung showed off a prototype of a folding display today. Folded, it’s a smartphone. Unfolded, it’s a tablet. Neat!

Less neat: the company sort of went out of its way to not really show very much. A prototype was on stage for about 45 seconds, and it was deliberately backlit to be intensely silhouetted. They “disguised the elements of the design” to keep whatever secret sauce they have secret.