I was going to post on this myself. As others have said if it is intentional that heroics at level 75 lose the alliance crates, that is a bad idea. As easy as it is to max level, especially a 5 level increase, it is conceivable someone can hit level 75 while still playing knights of the <fill in the blank>. That means a hard stop on specialists' reputation.
I also believe that if renown crates are the direct replacement for command crates as has been advertised, they should still contain cosmetic armor drops.