Samsung is working on foldable displays for many years, as the company is looking to release a foldable phone that will be able to merge the phone and tablet markets (or possible a small phone that opens to a smartphone sized display). The company has recently accelerated its efforts, and such a phone may be released in 2017.

Foldable OLED concept (2013)
The main technology development drive is centered on the foldable OLED display itself - which is being developed for many years. According to a new report by ETNews, Samsung has decided to "test the waters" with a foldable phone that uses two different displays. This dual-screen phone will be easier to produce than a phone with a foldable OLED display. Of course the two displays, even if these are very thin-bezel ones, will still not merge to a real single display when the phone is open.
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Meh...I love OLEDs in phones but after getting my Galaxy S7 the one thing I really wish for is for Samsung to either stop with that curved display stupidity or find a way to offer hardened glass protectors that work with curved screens. Since right now there does not seem to be a single good solution for this out there. All you can get is either plastic or it only covers (the flat) part of the screen which destroys the usability.
A dual screen is way down on my priority list right now...