Seriously, just listen to the music they put behind the announcement trailer. I'd listen to that trailer on loop to just hear the chorus of voices and ascending music after Grommash says "and all others" because that is some good music. I honestly feel like Russell Brower doesn't get nearly enough credit for how amazing WoW can be at setting a tone.
I don't even know what we should discuss here. I guess you can talk about how awesome all of Blizzard's musicians and sound designers are. Because they are.