The G48 has me interested, which is a first for Glock. Normally I see their new guns and just see a company that's a one trick pony, but the G48 is unique enough that I'm paying attention. Usually when a company makes a slim 9mm they have this odd reason to chop the barrel down to 3 inches, but Glock is coming in and saying "No need to do that."
It's not that I feel a 4+ inch barrel is necessary for velocity, it's for the sights radius. I'm not hip to putting red dots on concealed pistols, adds to the size, weight, potential printing, etc, so I rely on standard sights to do any shooting. The longer the sights are for me, the better I shoot.
Whether the barrel is 3 or 4 inches, I'm not pocket carrying a 9mm, they're just too big for that. If it's going to be on the hip or in a shoulder holster, barrel length is irrelevant to me.
I'd say my biggest issue is that it's too thick. For a few millimeters more in width, I could carry a G19 with 15 rds.