Check out the entry here. The VDT logo appears about half way down the page. It’s very similar to the original logos for both The Lion, the Witch and the Wardrobe and Prince Caspian, which is great considering the change in production studio.
According to Jim Hill’s blog, 20th Century Fox is trying to get companies and t-shirt makers excited about Dawn Treader. This picture comes from the Licensing International Expo 2009.