So, the interview with Tom Chilton on the front page mentions;
That sounds to me, like SoO will open over a few weeks / months, like ICCFlex difficulty will open at the same pace as the Normal difficulty raid
Then I remembered reading this...
Leading me to believe its true.The tyrant must topple. The Siege of Orgrimmar is a 3-wing, 14-boss raid for max-level players, which will call you to take down Warchief Garrosh Hellscream at the head of a host of Azeroth’s finest.
It doesn't bother me, just thought it was interesting