7.62 Tok, .22 mag, .22 lr, and 5.7mm. But 7.62 Tok isn't far enough removed from 357 Sig, .22 mag and lr would be blowbacks, and 5.7mm...well it's 5.7mm. Probably wouldn't even work in a tilt locking barrel. I'm not sure exactly how the FiveSeven operates, but it's not tilt lock.
I guess 460 would be something novel, but I'm not sure it's that far removed from full power 10mm. Not to mention it destroys guns and requires a muzzle brake. To be honest, I feel like Glock has too many calibers. They could chop 45 GAP right off the bat, and I feel like 357 Sig could go too. They could offer 9mm, .40, and 45, then just let the aftermarket barrel makers take care of the other calibers. That would simplify their production line, decrease cost, and probably lower the price.