Well, Wrathion is talking past tense when he mentions Varian.
Combined with the odd death sound im inclined to state Varian dies.
Sure, it could be used to describe past actions but the Alliance really needs a death tbh, the Horde will at least lose Garrosh, maybe Voljin and imagine a Varian after that battle.
He would bitch about this 'war' for the next 3 expansions while even Thrall regaining the Warchief title wouldnt be able to talk him down a bit.
Jaina has some control to the situation but a Alliance/Horde combo taking on the burning legion next xpac is rather unlikely with Varian at the head of the table.
Wrathion is progressing decently as a character, however his voice over doesn't seem to indicate he'll be directly involved in the final battle.
Which is a shame really, when you are THAT powerful as a character and then dont even attempt to help directly in the fight we have been waiting for since MoP released it kinda takes away from the power.
We already have Tirion, the fucking Ashbringer himself, not using his power in any meaningful way since ICC so meh.
I'd love to see more actual participation rather then telling my alts to get honored with him and get some legendary sigils while standing in that bloody inn.