This could happen if Apple puts into practice a new patent that has just been approved and that implies that this screen lengthens a little more occupying part of the strap. We have a few days with several news about the Apple watch and the possibility that Apple adds sensors on its straps for the next generations of the device. In this case, what we see is a larger part of the screen that would serve to insert more sensors into the watch. As you can see in the header image, the glass and the design itself would be different, much more rounded than the current model in addition to taking that curve that the watch strap occupies right now and that would become a screen.
La Patent office American exposes this document and makes us think that in a future Apple Watch may receive a major design change. In addition, you will need a somewhat more flexible glass like the one that some curved screen devices have today to be able to house those new chips that would give the device more options.
In this case, the glass, the watch case and the strap itself will need a complete redesign to be able to carry out this form. On the other hand, we do not have to focus much on this design either since it is not what is mentioned in the patent, what we do see is that if this is the final design, some users with narrower wrists may have problems when fastening the device as it will be somewhat stiffer. In short, a new patent that may or may not come to fruition and is that Apple records everything it can and then it will be seen whether or not it uses the patented thing on its devices.