Ι can not find any difference between 4 and 5 in the Apple TV 4 except iCloud synchronization
the list of changes can be found at Infuse Release Notes | Firecore.
I assume the list of differences will get longer as new version 5 releases arrive. For instance we have already been told that support for VIDEO_TS is well along the way to being ready for the 5.1 beta testers.
no substantial difference be worth re pay
I paid the full (non-subscription) price just for this 
*Added video and audio specs to pre-playback screen
I’m with aarfing on this one.
The addition of video and audio specs to the pre-playback screen is pure GOLD!
The fact that this is even a question shows how badly the v5 communication has been handled.
No, because people who can’t read are everywhere unfortunately.