Anniversary or not, they're removing the 40-man.
This poses a problem, in that they're possibly erasing the tier 2 helm from the game, among some other loot.
I see it as a hint that they may eventually re-do BWL and possibly MC (legs, rag) the same way, or remove the tier drops from those raids, in order to keep consistency.
Can't have a set with 7 pieces obtainable.