As ziggyosterberg pointed out:
They did one last year that some of the interviews appear to be from. They had the same quote from the vocal fry woman - "These were broodal cryme scenes" - in last years preview. They also had Jakobson in the preview of last years episode, but I don't remember him being in the actual episode that aired last year. If he was in it, it must have been a very brief appearance. I don't think Roger Smith was in last years show at all.
I recall that last years show was thought to be a two-parter, and the second part never aired. I don't know if that has anything to do with this. From the preview it looks like some recycled stuff from last year mixed with unused interview footage from last year, and the "rare, in-depth interview" with Roger Smith, which appears to be new.