I don't know how reputable her sources were but I had a conversation with a Samsung rep about the s8 and she said that samsung is going more towards a foldable screen so the s8 will turn into a tablet and have an edge on the right side while in phone mode.
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That would be pretty darn amazing if they could pull it off and keep it in the same price range. However, I wouldn't expect to see a dramatic change on a flagship device before Samsung was convinced the masses would buy it.
Here's what I expect from the 8 line (processor/ram/battery/camera upgrades apply to all)
S8 - 5.1 inch, 64 GB on-board, SD slot, metallic or plastic textured back, shatter-resistant glass
S8 Edge - 5.5 inch, 64 GB on-board, SD slot, metallic or plastic textured back, some type of strengthened or flexible display
S8 Active - 5.5 inch, 64 GB on-board, SD slot, sealed design, some type of strengthened or flexible display
Note 8 - 5.7 inch, 128 GB on-board, SD slot, metallic or plastic textured back, a flat screen design with shatter resistant glass or flexible curved display.
32 GB variants are the norm now, but why stop there? In a few years, 64GB will be the norm and then 128. Is it really that much more expensive to just throw the storage capacity in?