yeah I remember that, they said they would have to go into a small room, practically a closet just to test a demo with character X in it.
Does the ESRB act like that though? Are secrets kept amongst secrets there?
From my understanding of the ESRB's practices, they only have to be shown a general amount of content, along with specific things that could definitively effect rating. Hence the leaked videos focusing on female Trophies' skirts.
This is just my opinion, and I don't want to list characters and whatnot, but if I was Nintendo and didn't want to put all my eggs in a basket when it came to the ESRB videos, I could, for example, include Lucario in the video to be rated, but probably not have to include Mewtwo due to similarities. This works in reverse, like how Duck Hunt Dog uses ducks as a means to fight, Wario's flatulence, ect. regarding why they
are included.
The same can be said against characters like Bayonetta and Snake because the ESRB would definitely need to see videos of them due to their nature as characters, so they are more than likely not in the game.
So in other words, they wouldn't need to show them more than they needed, just like the testers don't. Again, I still wouldn't say there are definitely more characters yet to be revealed, but I can personally assume so. Another argument could be proposed against this logic, 'because why would they need to have Dr. Mario, Dark Pit, Falco, ect. in the select screen, under the same reasons?', so I'm by no means claiming clairvoyance in what Nintendo does and doesn't do, just wishful thinking I suppose.