It seems as if the next patch with raiding after 5.2 will be the Siege of Orgrimmar patch. What am I using to claim this? Wrathion's own words in the final quest of the 5.2 chain:
Seems very interesting. I am both disappointed and not at the same time. I am because I had assumed we would be dealing with Y'Shaarj or the Zandalari (Since the majority of 5.2 is the Mogu with basically a Zandalari cameo at the beginning), however I am also super excited for the Siege of Orgrimmar patch.The Thunder King is dead, and his instruments of oppression are being picked over by the Alliance and Horde for their own ends.
We come now to the climax of the pandaren campaign. Hellscream's machinations have brought the Alliance down on his head - but even more importantly, he's fractured the unity of the Horde. As the Pandaren say: "The Wok is Hot." Something is about to give, and all of our work comes down to this.
I need time to plan. See me as soon as your faction is ready to make its move!
I've read most of the 5.2 dialogue and I'm not sure what Wrathion is talking about with regards to bringing the Alliance down on his head. I suppose he could simply be referring to Anduin and Theramore, but that didn't seem enough to really make the Alliance go batshit insane and go immediately after him.
I'm more curious about the Horde, though.
It seems as if, currently, its only really Vol'jin who is actively (at least at this moment) talking about a rebellion. Lor'themar flirts with the idea in 5.1, but, unless I'm missing something in 5.2, he doesn't really address it again in any large capacity.
I'm certain that 5.3 will probably be Azeroth-based stuff before the actual raid, but I'm still curious as to Wrathion's words. Or perhaps we're just missing some dialogue in 5.2 that changes things up still.