Samsung has patented a version of a device currently rumored to launch as the OEM's first-ever rollable-display phablet that can house a stylus. This has given rise to speculation that the next-gen form-factor in question actually exists to assure the Galaxy Note line's place in the world after all. It just so happens that Samsung has trademarked a name to back this idea up already.
https://www.notebookcheck.net/Samsung-s-Galaxy-Z-Slide-might-turn-into-a-next-gen-Galaxy-Note-one-day.563073.0.html