Don't hold your breath. The only way Glock can offer a single stack 9mm the size of the G42 is to make it in the U.S., and U.S. production is at capacity already.
The Glock 40 and the MOS modded G34, G35, and G41 can be successfully imported, so they can be made in Austria where there is excess production capacity.
The predicted G43 is nearly identical to the made-in-USA .380 G42. Given the demand for the former and the success (at least for competent manufacture and brisk demand) of the latter, methinks they’d switch the G42 line mostly over to making G43s, now that the production line is solid and demand would be far higher (possibly with greater markup).