My local gunshop called to let me know that my Glock 23 and 27 Gen4s had come in! They said that Glock was definitely shipping now and that they had received more Glocks in the last two weeks than they have all year. Blue Labels, even for law enforcement were running almost two months. My pistols took 2 1/2 months.
Build quality is very good. Finish looks like it has changed again. It is more dull and a little greyer. It looks like it will scratch easier than previous iterations, but it is too early to tell. Frame is still stamped made in Austria - folks had been telling me that the all U.S. made models had replaced the Austrian made ones. While the U.S. made models do exist, it appears that they are not in U.S. distribution yet (at least for the models I bought).
It also seems that Glock has been doing some work here. The original Gen4 triggers felt gritty, heavy and stiff (IMO), at least when compared with Gen3s. This pair have great triggers. It is clean with a crisp break. In fact, I think that the reset it better than the Gen3. The break itself seems to have less of the "sproing" found in Gen3s.
I really like the "cuboid" grip texture. The small grip of the 23 fits my hand even better than the Gen3. The 27 small grip may be a bit too small. Range time will tell. I didn't like the mag release in pics but it does feel pretty good. I found nothing wrong with the Gen3 release so I would have preferred that they didn't change it.
That's all I can think of at the moment. I am glad to have some Gen4 to gain some experience on. Even the Glock Armorers Course was very light on them. I will report back when I get some range time on them. Unfortunately, I didn't expect both to come in at the same time, so I ran out of $ to buy ammmo :)
Eventually these will replace my other non-Glock brand polymer pistols as my daily CCW.
Obligatory camera phone pic below (click pic to enlarge):