That is Tuesday, 9/16. Paul Thurrott's site and the Zune insider are ablaze with info.
That said it is still blocky but thinner and comes in 8GB Blue flash, 16GB black flash, and 120GB black HDD units:
http://www.winsupersite.com/reviews/zune3_preview.asp (Preview of new Zune HW and SW)
http://www.zunerama.com/2008/09/first-look-zune-16gb-player/ (Features unboxing pics up close)