You must be talking about something different than what I saw. The art I saw did not show people flying on banshees. The leaked plans I saw showed the plans for the entire area, including the boat ride. Before we continue, let's make sure we're talking about the same thing. Did the leaked plans you've seen show the entire area and the boat ride? If so, we are talking about the same plans. If not, let me know and I'll go through my hard drive and post it.
EDIT -
The leaked plans I have, I found on a different website prior to when the person you said leaked it to this site leaked it. I doubt he is on the inside.