RECOIL Magazine has an information regarding a new version of G43 called G43X. It features longer grip to accommodate 10 rounds instead of current 6
https://www.recoilweb.com/glock-to-release-10-round-g43x-pistol-144330.html
The graphic is what RECOIL Magazine made based on their information.
EDIT: Glock 48
RECOIL magazine once again has an article about new Glock. It supposedly has 10 round capacity, and is a single-stack pistol about the size of a Glock 19.
https://www.recoilweb.com/the-glock-model-g48-rumors-and-rumint-144366.html
From: RECOIL Magazine