I am waiting for the .40 s&W version which will only require a different Barrel and Bolt Face which is changeable.
The .40 S&W mags are essentially the same as the 9MM mags and fit in the existing Glock mag well with no other mods.
If they do make it it will probably be the only variant with the possible exception of .357 Sig which uses the .40 S&W mags as well.
I was told the blowback action can't contain the 10 MM cartridge and .45 ACP has too much bolt thrust. They also would require a different mag well as both use Large Frame Glock Mags.
Randy