Chatter on GlockTalk.com indicates that this may be released commercially soon. See also this product listing on Omaha Outdoors.
This was originally developed for CBP, of course--allows for increased parts commonality with the Glock 19. Additionally, the 47 slide runs on a 19, and a 19 slide runs on a 47 frame. In combination with a Glock 19, the 47 becomes pretty compelling. Buy the 2, and you get 4 configurations: A Glock 19, a Glock "17", a Glock "45", and a Glock "19L".
Any of our well-placed sources have an idea on timeline?