If you had your money on Monday, Sept. 10, as the day and date that Katie Couric would debut her new nationally syndicated talk show, you’ve won the office pool. In a webcast Thursday to TV stations that have bought “Katie” for their lineups — including WJLA (Channel 7) in Washington — the show’s executive producer, Jeff Zucker, unveiled the “Katie” logo, which looks suspiciously like the old Oprah-show logo.