Agreed - Lo Ferrigno should be very interesting, and we know that Dan will ask the most interesting question that everybody wants to know - why does Lou insist on collecting $20 from everyone when all they want to do is say hello and take a picture with him via their own cameras.
As for Milos Sarcev - he is going to be great. Milos always speaks his mind, and has had many experiences in the last few years that many people would like to hear about - such as his run ins with Shawn Ray and Steve Weinburger, his outspokeness on various topics, his ability to transform competitors into high quality physiques, and his own career of 60+ (I think) pro contests, and much more.
For Ben Weider - his obsession with Napolean, the stories of the beginnings of the IFBB and how he encountered racism, what he views of bodybuilding in this day and age, and if he hears about the criticism of the fans, the athletes, and what can we do to make bodybuilding better. Also, of course - what happened with Wayne DeMilia and Ben, since they had been friends for 25+ years.