Engadget:

One of the most pleasant surprises out of last week’s Apple event was the announcement that purchased iTunes movies would be automatically upgraded to 4K for free. Well, it turns out it’s not actually that simple. A support document from Apple tells us that users will not be able to download 4K versions of their upgraded movies from iTunes; Ultra HD is limited to streaming only.

While this makes sense, it’s one of those things that might put people off the new Apple TV.