Sure, imported pistols have to meet a point system by law, which includes having a caliber of a certain size. I think this was an attempt to keep "cheap foreign saturday night specials" out of the country. The .380 doesn't have a enough points to come in. I can't rattle off the exact statute at the moment.
The .380s look to be on the same frame that you can get a 9/40/357 in so without hicaps I don't see any real market for them.
I would like to see a more concealable Glock, like a single stack 9, (I see I've said that before
) but the rumor is that the 37 is a single stack 45, that production has been put off for awhile (perhaps because of the frame recall problems?). DannyR from Glocktalk seems to know what's up and has some kind of close relationship with Glock. From what very little contact I've had with him he's a trustworthy source of information. Oh and he's a nice guy too, provided me with some very good advice about Glocks.