It seems that Samsung will soon release a new phone called the Galaxy S6 Edge Plus. If this story is true, it will be a GS6 Edge variant with a larger display (around 5.7" inch, as opposed to the 5.1" display found in the original GS6 Edge). The display will of course be a flexible AMOLED, bent on both edges.
Apparently Samsung already sent store dummy units, and you can it next to a Galaxy Note 4 above.
This is not the upcoming Galaxy Note 5, which (following the success of the GS6 Edge) will probably also include a flexible OLED variant (or maybe be an exclusively flexible OLED device?). It's likely that the GS6 Edge Plus will use the same hardware as the original GS6 Edge, maybe with a larger battery.