From what I understand, it's not going to be entire episodes from the Third season, but highlights and extended sequences. Also, it's only the third season and those musical performances from that same season. The Who and possibly that Donovan performance are from the first. But in talking to a rep from the Smothers Brothers official website, the second and first season are in the works, in that order.
I'll be anxious to hear from anyone receiving this set from Time Life how it looks and what exactly is on it (it was scheduled for August 25th). I will pick up the non-exclusive version next month that doesn't also include the documentary (I already have that).
Awaiting reviews.