Questions: About Vargas (To GMA?), Unger, Schleiff, Nightline, Couric’s Farewell…

Have answers? E-mail tvnewser@mediabistro.com or drop them in the tip box…

> Wouldn’t Elizabeth Vargas be a natural host of Good Morning America when Diane Sawyer departs? “Don’t forget, she got her start on ABC as the news reader on GMA and was considered a possible replacement when Joan Lunden retired,” an e-mailer says…

> Former Daily Show correspondent and current NPR “Day to Day” humorist Brian Unger, who has been filling in for Keith Olbermann of late, will be back in Keith’s seat on Friday of this week and again next Monday and Tuesday. Could Unger be on the verge of a deal with MSNBC? CNN may also be interested — Unger recently taped a pilot for Headline News, a tipster says…

> Does Henry Schleiff like his new view at the Time Warner Center? He left Court TV’s 3rd Ave. HQ earlier this week…

> I haven’t seen the ads, but a viewer says Nightline is advertising what is apparently its new tagline: “A Brighter Take on the Day.” An e-mailer wonders, “does the show have a new mandate?”

> Is Katie Couric executive producing her farewell?