I read over on Cable Forum that Virgin Media and Disney are in the early stages of discussions to bring Disney+ to the 360 boxes. There is no timetable and no guarantee that any agreement will be reached.
Longer answer: VM haven't yet announced an agreement with Disney for this app, and their advertising reflects this. There's a very good chance that the first we hear about the app launching, is an announcement to the effect of "the app is now available"
VM have a strong track record in not announcing these sorts of launches until they are live.
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