20" wheels and sports suspension are not standard. Look at this post below, it shows an actual window sticker.
http://www.fordedgeforum.com/index.php?showtopic=1336
The 20" wheels are listed under optional equipment. Now I suspect that all Limited's that are not order from the factory will come with the 20" inch wheels for three reasons.
1. I think most people that are looking at the Limited's want the 20" wheels.
2. Since they are listed on the sticker as "20" Wheels/Sports Suspension" they are part of a package. Making them not a swappable item. You could easly swap out the wheels, but not the suspension.
2. If they all come that way, the few people that don't want them will bite the bullet and pay the $895.00 instead of ordering one without them and waiting 8 weeks to get it from the factory.
A clever marketing tool by Ford. An option that they all come with, but you still have to pay for.
Clayton