Well I am glad that Glock has gone even farther partially suicidal.
This has to be the most stupid "innovation" to come down the pike since the magna-ring.
The 10mm was a legitimate attempt to bridge the perceived performance gap between the hi-cap 9mm and the harder hitting .45ACP. The 10mm being too stout for the faint of heart eventually became the .40S&W, sold alongside the 10mm.
The .357SIG seems more gimmicky, a necked down .40 that to my mind really only serves to mimic 9mm +p+ to claim ".357 mag from an autoloader!!!" A solution to a non-existent problem, but clever marketing.
Now we have the .45G. It is available in exactly one pistol. It has two published performance stats of 200gr at 970fps and 185gr at just shy of 1100 fps, IIRC.
The question is what does it add? You get bad ammo availabilty in a package the size of a Commander, gain two or three rounds, depending on what the 1911 shooter prefers to use for a magazine, at the expense of increased grip girth from a semi staggered magazine. In a Commander, one can shoot 230gr or 200gr+p or 185gr+p or 165gr P'werBall. Oh, and if the mag ban dies, a dedicated attempt to meet the arbitrary 10+1 limit of today will look stupid, especially if the common folk can once again carry full house .357SIG, .40s and 10mms and have equivalent ballistics with generally higher capacity or smaller platforms.
.45 ACP is expensive to shoot premium factory ammo from and I am certain that .45ACP drives a goodly portion of the ammo reloading industry. The availablity of .45ACP brass is next to limitless, making reloading cheap. Even if the .45G only needs case trimming of existing brass to be reloaded, most people will not want to make the effort and it will take years to develop any sizeable pool of once fired brass.
I predict a lingering death for the G37 and any offspring, especially given Januzzo's brilliance on the eve of the SHOT show.