I don't see the rep requirement being removed, but it's almost guaranteed that they'll move down to Justice.
I do like the idea of having the roll window increase with dated content.
Say this tier, you require a roll from 80-100 to win an item.
Upon 5.2 release, that window opens up to 60-100, and 5.2 starts at 80-100 Not guaranteed, but much more likely.
If a new raid drops in 5.4, the 5.0 tier is now 40-100, 5.2 is 60-100, etc.
I do like the sense of progression with their current philosophy. New dungeons would be appreciated, add them parallel to the previous tier's raids, but there are other options.