She's actually wandering around Deepholm now. You can talk to her and she thanks you for freeing her from her corruption. She also calls Deepholm her home and is classified as an elemental, while the other mobs with her model are all giants....read into that what you will.
It appears this post is not quite speculation. It seems fairly accurate.
And also the speculation on the creation of Divine Beel using actual Titan flesh is not so much of a speculation as well!
Yes, Myzrael's title implies that she is actually Therazane's child, not unlike Theradras or Ozruk. Obviously she got all of the good genes. Although to hear Therazane tell it, she has apparently been disowned. Probably reminds her too much of her father. :P
OMG 13:37 - Then Jesus said to His disciples, "Cleave unto me, and I shall grant to thee the blessing of eternal salvation."
And His disciples said unto Him, "Can we get Kings instead?"