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They've over hyped everything so far, so don't overthink it.
The way I see it, there's probably 2 things that'd be considered a huge scoop.
First is the images and names of the starters evolutions. Since they're putting a huge emphasis on it, I wouldn't be surprised if we see both the second and third stages.
The Second thing that'd be a big reveal is the Second Mewtwo forme that Pokebeach talked about. Considering thus far they've only hinted at the Mewtwo version (and it starred in the movie), the Mew version would be probably the biggest shake up ever as no one is expecting it. So far that's the only thing from the leaks that haven't been revealed yet. (Meowstick I'd contribute to being one of the things meant to discredit so it probably isn't true)