Predictions:
It will involve a lot of old characters probly developed for it a while ago, like the hellraisers and choppers
It will probably not be very hard, except like the last half of madness which might have some surprises
It will be largely based on old school maiden but as a wild guess I think will include some stuff from more obscure albums/songs
The rewards are probably going to suck, im sorry to say
There will almost certainly be some events involving it