I actually expect them to use the eye design that has been used on every main Kamen Rider since W. See my sig to see what I mean. Beast also uses the eye design.
Uuuuh... those are similar, but all still pretty different, especially decade. They're just variations on the same basic design that almost every rider has had since KR1, bug eyes. But While they are all different, I agree we will probably see another design like those, rather than a sentai style visor or anything else. Though it is notable that wizard has one of the most different/original eye designs in KR, similar in shape to decades, but rather than a raised bug eye shape, its more of a shape of an eye created by the silver lines at the edge. So we could see something a little different, you never know.
Oh actually scratch that, I just realized decade is after w lol, and kiva, ryuki, hibiki,decade, den-o and faiz all strayed pretty far from the bug eye with almost every design. So, I guess I'm super dumb.