Those changes require a modification to the actual terrain. With the event scheduled, there won't be any changes to the terrain.
Anticipating the question, could this have been done before we scheduled..yes. Midway was the scheduled event, there were some terrain issues, and this one is being ran instead, as it is, so there won't be any delays.
As for skins, we haven't had any submitted, we'll probably go with what we have since it's getting a bit late into the process.