If Glock is going to do a US .380 I sure hope it's delayed blow-back, unlike the Glock 25. With the price of .380 compared to 9mm and the heavier recoil of straight-blowback designs, I see no point in not going with the delayed system.
On another forum, someone overlaid a Zippo on top of an S&W Bodyguard 380... looked to be about exactly the size of the Glock outline, so -- may be a relatively safe bet that the Glock 42 is their Ruger LCP competitor.
As for the Glock 41... Someone released the model #'s in their catalog, and it showed as "pg4130103". Search for that on sportsmansdepot.com and it brings up Sportsmans Depot - Search Results for "pg4130103", saying "Glock 41 Gen 4 .45 ACP 5.3 AS 13 RD", MSRP $774.99, their price $645.99.
Not saying there's truth to any of this, just reporting what I've seen elsewhere...