They are not wink. There are a bunch of threads on the new mix chnls. As of now you can tune in seperate audio for each video box, but if you have one of the new D* branded receivers you will be able to highlight the box; after it get the new software.
Like I said you can tune in the separate audios like we all can, but you can't perform the intended mix features that the new D* receivers are supposed to.