Seems like most movies just have no format info
when view thru Apple TV.
If iTunes shows the DVD version in Widescreen can I
assume that the Apple TV HD version is also Widescreen?
HD implies a certain minimum resolution, but is also designed exclusively for a 16:9 display format. However, the source material can be any aspect ratio and black bars be added to maintain the proper aspect ratios. Any movie put out prior to 1952 or 1953 will be 4:3 and should be pillarboxed.