Geoff Boucher of the Los Angeles Times, said yesterday: "David Tennant just happens to be making his very first trip to the San Diego expo to promote "Doctor Who," a television series that he will soon be leaving behind. "Peter Jackson, the producer of the two-film "Hobbit" series that begins its theatre run in 2011, is also slated to appear this year, and, well you can see the dot-connecting possibilities. ...