Any update as to how this turned out? I have been looking/thinking of doing the same. I have access to a set of 2010 Mustang GT 19" 5 spoke wheels, and would like to know if they would go on a 2011 Edge.
This is what I have found out:
Both have the 5x114.3 bolt pattern
Both have a 70.5 center bore (so i'm assuming the hub size isn't an issue)
The only thing is I have found that most factory and aftermarkt wheels on the Edge are from a 38-45mm offset, while the mustang wheels in question are a 50mm I think. Normally, if there is no rubbing, I'd assume 5mm isn't an issue..but either way, i'm interested in how this worked for you.