While it's not official, I have heard this buzz coming for some time. Ford is expected to announce that it will be changing the name of the Five-Hundred to the Taurus for the 2008 model year. Alan Mulally, Ford's new chief, studied the Taurus' success while he was at Boeing and he called Ford's decision to not name drop the Taurus name "one of the dumbest ever." So it was only a matter of time before the Taurus was back.
Ford's nomenclature is ridiculous, and I've discussed this before. They literally believe that everything should be named with an E or an F. If it's an SUV, it's either the: Edge, Escape, Explorer, Expedition, Excursion (through 2005). If it's a car or minivan, it should be the Focus, Fusion, Five-Hundred, Freestyle, Freestar (previously Windstar), etc. And of course the trucks are F-Series; workvans are the E-Series. Only the Mustang, Ranger, and Crown Victoria are the exceptions. The Taurus and Windstar both were huge sellers with stellar reputations but they didn't start with an E or an F so they had to go! How silly!
Finally, Alan Mulally is in charge and at least he's recognizing their silliness and addressing the issues. It's hard to believe a company as large as Ford had fallen prey to such a stupid and unheard of practice.