This exact same difference in side curvature has been depicted in a 3D render format by the graphics artist Technizo Concept who often does videos like the one you see above, based on the latest design change rumors.
We’d still have three lens rings protruding from the back independently, rather than being a part of an elevated camera island “plateau” as on most every other major phone out there.
The main camera upgrade is not expected to carry over to the zoom cameras as they are still expected to remain a 10MP one with 10x periscope magnification and another 10MP sensor under the 3x telephoto camera lens.