I don't know where the PDFs are now, but according to GSN and Zap2It, What's My Line? and I've Got A Secret will be gracing the schedule once again during the holiday season at the traditional overnight slots of 3 and 3:30am. It looks to start the week of Christmas Eve, but no idea if it continues into the following week as the schedules only goes through Christmas.
Some of the listings give generic information or none at all, but most give out the special guests. Among the highlights, one of the WML? airings lists Claudette Colbert as the mystery guest. This could be the episode in which Groucho Marx wreaks havoc on the show (Claudette appeared on the show twice as a mystery guest). One of the other shows listed that week is was 11/15/64. That was the show the 2nd Groucho show which leads me to believe that the Claudette Colbert show listed this week is probably the first one.