A tech blog claims to have learned from "exclusive" sources that Samsung is working on a next-gen budget Galaxy M-series phone with a battery rated for an impressive 7000mAh in capacity. This "M12" is also apparently destined for a 6.7-inch display with a punch-hole selfie camera. These claims may be backed up by new images of a rear panel for this putative device.
https://www.notebookcheck.net/New-leaks-point-to-a-future-Samsung-Galaxy-M12-with-a-7000mAh-battery-and-eye-catching-finishes.503795.0.html