I was just looking at the Old School page at Muppet Wiki, and all bonus clips were listed. I am not sure if the person who contributed to that page got an early copy, if that contributor is the person here who got an early copy, or if that person found out some other way. And there are not nine bonus clips per season. The number of bonus skits vary, and it seems like the second and fourth seasons both only have a small number of bonus skits compared to other seasons. And one good thing is that the closing credits sequences from each season will be included alongside the bonus skits.
I can't remember everything that was listed, but the version of Being Green included is the original one. The version of Rubber Duckie included is from the first season as well. Other bonus skits include I've Got Two, ABC-DEF-GHI, Bert's Bust (that's how it's listed..... I assume that this is the skit where Ernie made a clay sculpture of Bert), Would You Like to Buy an O?, a Harvey Kneeslapper sketch, a Batman sketch, a Superman sketch, a Prairie Dawn pageant, one of Mumford's magic acts, and more. I didn't see any sketches listed that I know have Proffessor Hastings, Little Jerry and the Monotones, or Beautiful Day Monster. The only bonus Kermit skits that I noticed are Being Green and Sesame Street News: Rupunzel. I didn't see any bonus Jazzy Spies or Baker films listed (so we'll have to wait untill at least volume two, if ever, for Rowlf's cameo). I also saw a skit listed called A Special Day with Ernie and Bert, but I don't have any clue what that skit is (the only one I can think of is the one where Ernie doens't think he's special, but that's in the third premier).