I think that's what Blizz is going to do- try to retcon dead Sylvanas as the genocidal fuckwit and alive Sylvanas as the hero of heroes who heroically did heroism and deserves the highest of praises. That's how they'll bake their redemption cake, set her back to the personality she had for all of 3 missions in WC3 and that nobody cares about except as an abstract.