Tom Hiddleston as Kael'thas if it has to be the Arthas story.
I agree about the stormrage story. I would soil myself. And if it is I can't wait to see all their costumers, makeup, tattoos...I'm sure they'll make it look amazing. Not to mention GLAIVES. I would pay big money for the glaives used in the movie. Idk much lore so idk if illidan has them that early, but oh man
I agree he could make a perfect Arthas if he grew his hair out a bit longer. Though....I'm not sure exactly what period of the Warcraft timeline this movie will cover. If the movie is going to be about the old Horde vs Alliance wars, Arthas won't have much involvement.