We have been hearing about foldable phones for years and we have seen sloppy attempts from some companies (we're looking at you, ZTE Axon M), but the technology is finally expected to reach its final stages towards the end of 2018.
In a leaked slide, Samsung is said to be considering showing a foldable phone at the very end of 2018: the Samsung Galaxy W, but the company has said that it has postponed the actual launch until 2019 as it is working on perfecting the technology and it still has its successful curved Super AMOLED displays around.