Love the spy shots of the stage. I'm a stage geek and love this stuff. The sound towers are standard for large stadiums as mentioned. what is interesting is the main stage. The three large "arms" that hold the front stage are odd looking. Directly behind the deck of speakers on all three arms is what is grabbing my attention. It looks like multiple lights that would move or open up at particular times.
The left side of the stage looks like an LED screen and probably will be the entire length - similar to the dream stage set up but looks bigger. B stage is definitely a tree and agreed it looks high on that ramp section connecting to the main stage. It will be interesting to see the final pieces all connected. There is always something with these stages that surprises. Trabants, rising LED screens, lemons, rising staircases (Popmart), expandable screens (360), walk through screen (IandE), etc. Something amazing is going to be part of this stage.