Well, I picked up a new Gen 3 Glock 19 today, and I was surprised by two things I found in the box.
The first was a brochure on "Glock: 25 Years of Perfection," and the years were 1986 - 2011.
The second was the casing from the test fire shot at the Smyrna, GA HQ. It was collected on 09/26/2011.
These two items brought me to the conclusion that Glock is still manufacturing Gen 3 Glocks, and I was very happy to find this out!