So I was thinking about this after making the thread about how there won't be a raiding tier in 5.3.
Is there enough content left after ToT for Blizz to make T16 the tier before Siege of Orgrimmar?
The mantid Empress is dead. 6 of the 7 Sha are 'dead' (I'm guessing the Sha of Pride is being saved for SoO), the Mogu leader will have been defeated, the last of the fighting Zandalari will have been subdued. There probably isn't enough content/lore behind the Saurok, Hozen, Jinyu or Yaungol to have a raid based around them.
Without any sort of retcon or CoT thing (which can't happen anyways), the only thing I could possibly think of is some sort of Alliance-related raid (since most likely Siege will be more Horde-related), and even that is a stretch since the Alliance doesn't have the same sort of inner turmoil the Horde seems to have.
Any possible ideas?