While I was searching the interwebs for a blue post about another topic I came across an interview with Metzen by Pc gamer and he said "We’re all going to make it together through this storyline. And it may not be the end of his story. But it’s gonna be a glorious moment.". I don't know what the hell he meant by that but it would royally suck if Garrosh didn't die.
Source:http://www.pcgamer.com/2012/03/30/ch...real-villains/ the quote is from the fourth paragraph under the "Having Orgrimmar be the next big part, that’s gotta just fuel the fire, right?" question.