What I'm interested in is the other information revealed by the video.
Firstly, both underwater and on land areas for Celestia have been revealed. An on-the-beach area, and some undersea street with coral encrusted houses. Sweet. The Shark is indeed an underwater mount, and wizards don't appear to require any sort of helmet for deep-sea exploring.
Also, two spells have been revealed: A large, bird-faced man wielding a pole-arm and an ankh, and a djinn straight out of the mythos of the Middle East. For those who don't know, the bird-faced man is likely Horus, Egyptian sky god, son of Osiris, god of the dead, and Genie is actually an English corruption of the word 'djinn' who are spirits in Islam that hide in another dimension. Due to the fact that Horus matched Balances' Egyptian theme (Scarab, Locust, Scorpio, Judgement, Alhazred) and that Djinn are described as 'spirits of fire', I would place my money on them being Balance and Fire, respectively. Awesome.
Can't wait to see what the others will be, especially if they keep expounding on this theme of mythology.
Until next time!