I thought it would be good for there to be a list of what sceanery has changed. That way none of miss anything good.
I'll list stuff as I find it. Here is one that I have found that truly blew my mind on how much it has been upgraded.
The Kenndy Space Center Launch Conplex (X68). Has made a MAJOR change. If you want to have some fun, Try flying the J-3 Cub under one of the launch pads.
I also checked out Disney World. The scenary hasn't changed much but it still looks pretty good. (Anyone know it Disney Land is in Anahime?)