As I said before, if there are any more venues that would mean there would only be 2-4 songs per venue or there would be less dreamscapes which would mean there's too much early stuff. There are only 45 songs in the game so the venues we already have would cover everything while allowing 5-6 songs per venue. That doesn't mean they won't add venues as DLC though.
All of the venues will get plenty of use with DLC, so I doubt they are worried much about underusing the announced venues.
To me, it would be tragic if the AHDN film wasn't represented in the game, and to a lesser extent that goes for the Help! film as well.