The final attack shown in this footage, is that black rectangle(the book) around our hands when we fire that beam supposed to happen? Because it looks like a major graphical glitch, I actually thought it was at first. This attack would probably look much better without the book, or with making it much more obvious that it is a book(arcane writing on the cover or something).
Not really fond of yet another resource, but other than that I can't wait to play the new class.