Sourced from relatively unknown tipster Fold Universe (meaning we can't vouch for the information's validity at this stage), the Z Fold S is described as possessing a 360-degree hinge, allowing it to fold both inwards and outwards, in a similar fashion to Microsoft's Surface Duo.
Samsung rumored to have a 3rd foldable family member next year, tentatively known as Z Fold S.— Fold Universe (@folduniverse) September 5, 2020
It has got 360° hinge that enables outfold and infold and works similarly like the Surface Duo.
The Fold S is a fully single flexible OLED screen unlike the Surface Duo dual screen. pic.twitter.com/S9HtkMQh20
Unlike the Duo, however, the Fold S is said to sport a single continuous OLED screen, rather than two separate displays - much like the existing Galaxy Z Fold 2 - giving the user a larger seamless canvas that, when folded, can either wrap around the exterior of the device or remain protected as the inside face.
Fold Universe also shared a clip from Chinese display manufacturer, Visionox, which shows a foldable concept demonstrating the "Innie + Outie" form factor as described to be used by the Galaxy Z Fold S.
Visionox made headlines last year by partnering with Huawei on future foldable products, as well as helping ZTE release the Axon 20 5G - the first commercially available smartphone with an under-display front-facing camera.
While rumours have remained quiet since the above 2020 rumours first emerged, and in the face of growing information on Samsung's other foldables instead - the Galaxy Z Flip 2/3, Fold 3 and potential Galaxy Z Fold Scroll - Samsung Display's showcase during the Display Week 2021 exhibition in May points to a number of future foldable devices that the company is potentially working on.
As spotted by SamMobile, Samsung Display showcased a range of concepts, and although none featured a 360-degree hinge design, there were OLED configurations that don't yet have an attachment to any of Samsung's other rumoured foldables.
A bi-folding design that's said to expand up to a 7.2in panel was seen, wrapped within the guise of a mobile device, while a larger book-style folding display transformed from a tablet to a monitor. A scrollable concept and a laptop concept with a UPC (under-panel camera) were also on display.
Whether that bi-folding design is what's become of the Galaxy Fold S remains to be seen, but other leaks at least confirm it isn't destined to be the Galaxy Z Fold 3.