I've seen it too. HMV also says there's going to be a 2 disc Deluxe? Hmm, have to decide to only get one this time. Covers must be the same too, since it's only an extra DVD :)
Yesterday I checked the german amazon page and it's the same there. I even checked the french amazon page and the deluxe version there comes with a dvd that probably includes the itunes performance too. I don't know why everyone keeps saying that the itunes performance will only be available in the UK because I never read anything about that nor was it ever confirmed by Gaga. So I'm guessing that it will be included on every deluxe edition. Everybody, just check amazon in your country and see for yourself if it's also available there.