Every time I right about the Garrosh fight and what I would want in it, I always have speculated that during the fight, Garrosh will become overwhelmed by the Sha and morph into an avatar of Y'Shaarj, who i believe is the God of War. It would be fitting where, in an expansion where war is the enemy, we fight the embodiment of war itself.
But anyways, i was watching http://www.youtube.com/watch?feature...&v=YjgvoQk7Tq0, and immediately became intrigued when it's shown that, like other Old God's, Y'Shaarj's blood is intact, and we fight his blood, instead of his shadow like many would have assumed. Now, alongside this, we see that immediately after going under Y'Shaarj's heart, the goblin Crafty gets sprayed in what can either be his blood or shadow, and is empowered, becoming the Echo of Y'Shaarj. This can all only mean one thing.
Y'Shaarj is nowhere near as dead as the Titans thought. Now, go ahead, link the interview where Blizzard said Y'Shaarj is very,very dead. We have seen many times, the most recent being the case of the Sha of Pride, that Blizzard will lie in interviews in order to keep things a surprise. Now for speculation.
In SoO, Garrosh will have removed Norkurions heart akin to Lei Shen, or do something to him that causes him to drain the Watchers power. He will be unaware of the 7th Sha (why on earth would the PC tell him). He will be in complete control of every emotion aside from Pride, which will consume him after Gorehowl breaks, causing him to lose control and be overwhelmed by all the other Sha at once. This will all happen in the proximity of the Heart of War (Y'Shaarj), which will, because of all 7 Sha being in such close proximity, break. His Blood will mix with is Shadow, all the meanwhile Garrosh is there with the powers of a Watcher.
If a simple goblin can become Y'Shaarj's Echo, then imagine what an Orc with the powers of a Titan who is possessed by the Sha would turn into.