grass type fan.
Fair point.... Still.....The way someone could have seen it is if they have access to private youtube videos before they are made public. But they never upload those trailers 3+ weeks before publishing, the earliest is 2 weeks. Also if someone is connected enough to see the trailer first that very far in advance then chances are good he has access to other information as well like another trailer that was not made public yet but he can watch it.
Either way there is no reason to doubt it at this point unless for those people who enjoy being contrarians for the sake of it.
I don't mind the gorrila bit, just not sure about the big drum part.