According to Joy Behar's site, she is scheduled to interview Jill Zarin on April 21. On the east coast, it's 9 p.m. on HLN. Sometimes dates get changed around a lot on these show, but that's the date for now.
I'm sure Jill is peddling her new book. I've got a hold on it at my library when it arrives.
I wonder if they will explore why Jill is acting so nasty on the show. I believe you can submit questions in advance.