This expansion is just Asura's Wrath. Fight a lot of weird corrupted monsters and a pantheon's big angry dude on the moon. Then the earth gets stabbed through. Asura even has the same voice actor as Illidan! (Liam O'Brien)https://www.youtube.com/watch?v=Ih8EM1RNmP8&t=8m19s
From what i know is... The new expansion wont have much to do with this sword... When we voted for the next expansion one mentioned something very nice... Remember reading about the Black Empire and Old Gods... I believe this sword just awoken them and we might see them in years to come... Be ready ;)
Like Excalibur, the next wielder of this sword will rule the world.I predict a gnome.Hunter Gnome to be clear.Because you know, this is a hunter weapon.
EXPERIMENT: Glowing 1,000 Degree Knife vs Azeroth
I seem to remember something like this happening on Asgard. It didnt turn out so well for the planet.