I remember that some people suggested that Hard Skool would be used as the new opener since it had a bass opening like It's So Easy, but nothing happened.
Most likely a band jam or something. I think there was a jam at the Argentina's concert or Porto Alegre, that someone said it was The General or another new song, can't remember. Oklahoma I think.
doubt it's any ACDC song, it's all well know songs, except from Riff Raff maybe. But I also doubt it cuz they brought Walk All Over You without soundchecking it, if i'm not mistaken
I think he's saying that the next concerts are going to be made with some equipments or something like that provided by the promoters. And their production is going to U.S.A and Canada.