Currently integrated only in high-end smartphones, the triple-camera setup on the back of the Galaxy A7 (2018) may suggest that Samsung is willing to make it a mid-range feature. The Galaxy S10 is rumored to include three rear cams, as well, but it seems like Samsung want to release this feature as soon as possible with the mid-ranger rather than the usual high-end models.
https://www.notebookcheck.net/Galaxy-A7-2018-is-Samsung-s-first-triple-rear-cam-phone.333266.0.html