@Mycroft I know Paizo have Archetype characters for each of their classes. Do WotC have similar? It might be a 'example of a cool new class you could play as' character to get non-MtG people excited for the book?
Otherwise, like, Niv Mizzet is "ok there's a dragon in it so..?" for people who don't know the setting. So I expect they wanna appeal to new ppl too.