Yaz was just approved by the FDA on March 21, 2006. It probably won't be shipped to pharmacies for a couple of months. It has the same two components as Yasmin, but a lower dose of estrogen (the progesterone is the same).
Another difference between Yasmin and Yaz is that Yaz has 24 active pills, and only 4 placebo pills.
To answer your question: Since Yasmin does tend to clear up acne/less weight gain compared to some pills, I would imagine that Yaz would do the same!