I have heard some rumors that the 4 cyl ecoboost may be available in the 2012? You can get the 6 cyl eco in the MKT, but that is getting back to Nav territory. I would guess the MKT will eventually be the successor to the Nav?
I have looked at a couple of Limited Editions 2010 MKTs--pretty nice units and another 4-5 grand less, but the dash technology just doesn't compare.
Joe