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Dolby Digital has always been available over HDMI, in stereo only.
There has been a lot of discussion on the forum about the fact that they're changing that, so that when a programme or a channel carries something better than DD stereo, such as 5:1, HDMI will carry that also.
Easiest way to tell if your box has received the update or not is to just open TV guide and see if the Sky logo is on the right next to the mini TV (Not yet received update) or if the Sky logo is in the top left of the screen you have received the update.