Ford is trying to develop a nomenclature for its cars and trucks. Cars/vans have F names while SUVs have E names.
Cars:
Five Hundred
Focus
Freestyle
Freestar
Fusion
SUVs:
Escape
Explorer
Expedition
Excursion
It gets sketchy when you consider that the F-150 is a truck and not a car, the Crown Victoria still exists despite being almost 15 years old, the Mustang name will never go away, Ford thinks there's still money to be had by keeping the Taurus around for fleet and, in the end, everybody still comes up with the same question: "Exactly what the hell is the Freestyle classified as?"

-SAV