Dan, you know as well as I do that Wheel will not be acknowledging daytime's 45th anniversary. The only parts of daytime Wheel that are acknowledged these days are Pat's debut, Vanna's "test" debut, and Vanna's "official" debut episodes.
ObTopic: According to two posters familiar with Wheel's inner workings at BAV, the week airing January 6th-10th taped on November 22nd. Vanna hosted, no audience was present save for contestants and their guests "to help calm [Vanna's] nerves." The details of who revealed the letters is being kept "under strict confidentiality", but they do say that the person in question was not Susan Stafford.
/damn near typed "who turned the letters" like it's 1997 or something.