Compared to the current Ford Expedition, this tester had a more upright front fascia and bore a taller, wider grille that appears inspired by the one that adorns the Ford F-150 and Ford F-Series Super Duty trucks
Based on the where the black camouflage covers are, it looks like the Expedition will get the same type of extensive 'refresh' as the Taurus did, with new front end/hood, fenders front and rear, back end and the nice interior/dash like the Explorer. Along with the latest technology.
Which worked out well for the Taurus. The same should happen to the Navigator for MY2015.