If recent trademark filings are any indication, Toyota may be considering a slogan change for its Lexus brand. From 1989 to 1999, "The Relentless Pursuit of Perfection" was the luxury automaker's primary tag line. In 2000, that changed to "The Passionate Pursuit of Perfection." Two weeks ago, Toyota registered "The Passionate Pursuit of Potential" and "The Pursuit of Potential." Could a new tag line for one of Japan's most prestigious brand be in the works? Earlier this year, we accurately identified Cadillac's "Life. Liberty. And the Pursuit" slogan. We also found Saturn's "Like Always. Like Never Before." Will Lexus be hit number three?