As has been blogged all over the place, WPF/E has been renamed Silverlight (Note: lower case 'L').
Some people say there's more to come at MIX07. Well, I think I've discovered what the secret is. It's hidden inside of the Silverlight promo video. Silverlight is written in Java! Don't believe me? Take a look at a frame grab from the promo video, clearly showing Silverlight's use of SAX, the javax namespace and use of Java API's like vector.addElement.