Popular Mechanics compares the original Knight Industries Two Thousand with the one designed for the new TV movie to air next February. The new one is a black Ford Mustang. And it has heated seats.

No mention of the "Knight Industries 4000" seen in the 1991 movie that failed to turn into a new series, a red 1991 Dodge Stealth. Nor Team Knight Rider, which isn't worth my time to mention any further beyond linking to this old-fashioned Knight Rider FAQ.

Not sure if this poster of KITT as a Koenigsegg CCX for a 2008 movie was ever real, but it's cute. Koenigsegg's web site; Wikipedia on Knight Rider, including info on the 2008 movie.