As far as I can recall Blizz. has been pretty clear about 5.4 being the last raid tier this expansion. So I wonder why the ambiguity in the language of the new "Ahead of the Curve" achievement:
"Ahead of the Curve: Garrosh Hellscream (10 player) Defeat Garrosh Hellscream on 10-Player Normal difficulty, prior to the release of the next tier of content.Reward: Reins of the Kor'kron War Wolf."
Compare to this tier's version:
"Defeat Lei Shen in Throne of Thunder on Normal difficulty, prior to the release of patch 5.4," which specifies the patch explicitly. The earlier versions were similarly specific about the deadline, requiring players to clear the tier, "before the release of "Throne of Thunder."
Probably this is reading way too much into things but since they have been pretty clear about 5.4 being the end of MoP's last tier, why not say,
"Ahead of the Curve: Garrosh Hellscream (10 player) Defeat Garrosh Hellscream on 10-Player Normal difficulty, prior to the release of patch 6.0."
To be clear, I have no skin in the game one way or the other; I would be fine with an extra raid before the release of the next expansion, and I'd be fine with 5.4 being the last tier of MoP, I just thought it was odd