If renders based on Samsung's recent patents turn out to be accurate, the upcoming Galaxy S11 and S11 Plus could offer a unique take on the slide phone concept. Renders seem to suggest that the Galaxy S11 could use a rolling display that can be extended upwards by about 25%. The slider display uses a 'waterfall' design with flowing icons and also conceals the rear multi-camera setup.
https://www.notebookcheck.net/Galaxy-fans-are-in-for-a-treat-Here-s-a-first-look-at-how-the-Samsung-Galaxy-S11-and-S11-Plus-might-look-like.434906.0.html
Looks...impossible, frankly.
Going historically, Samsung likes to first create a separate phone model to test the waters, only afterwards to they roll the changes into their main line.
so there might be an S11 Flex version or what not, but I doubt it'll be like that for the regular model.
i see the general idea of a slider phone. however, it's hard to tell how the screen will "extend" when the slider portion is moved up to expose the cameras.
also, how will the side/edges look/function? looks like it adds a bit more bezel to the sides. ghastly.