From the datamined installation story video this sentence caught my attention:
"Tyrael believed that only one drastic act would spare mankind from damnation. And so he hurled his sword, El'druin, into the Worldstone, shattering the crystal and igniting a catastrophic explosion."
I don't know the reason why Azureblade got it's name changed, I think it's related with the comic books "Sword of Justice". I also wonder with which name the sword is mentioned in comic books. What are your thoughts?