To clarify: anonymous only if the names are revealed at the end of the games.
Collabs sound interesting only if fanart inspires fanfic and vice-versa. Otherwise, it means fanart is only there to illustrate a story, which is a great thing but not all what fanart can be for. The choice could be left to the writers and artists, of course. And I hope comics would be allowed. I'd really like to see more. Also, one should be able to vote for art and story separately.
AR vs AU doesn't make any kind of sense to me - I've read the definitions, I swear! - but if that's what people want then *shrug*
About prizes, how would that work? Quantity over quality? Both? How do you measure support?