At the Chicago Auto Show on Feb. 6, the public will get its first look at a new Navigator that takes on a changed presence for the 2015 model year. Exterior design changes are accentuated by the reintroduction of Lincoln's iconic split-wing grille. Interior enhancements include luxurious leather and additional customer-focused technologies. The more refined appearance complements enhanced power and hauling capabilities that Navigator customers demand. The sleeker front end includes a newly designed hood, and...